- In the house we had a 26-33 seat flip. Many will talk about the average being ≈30 flips, but the recent average is even more losses for the incumbent. Bush gained slightly, but that was after 9/11. Obama's lost 66 in his first mid-term. Clinton caused "the republican revolution" with a 54 seat flip in his first term -- which had been the largest flip in that half century. (The media played down Obama's even bigger and more dramatic losses).
- Instead of losing 6 seats in the Senate as happened to Obama, or 9 seats under Clinton -- the Republicans gained 3.
- In Governorships, the Republicans did lose 7 -- but that's compared to gaining 6 under Obama or 10 under Clinton. More importantly, the seats they lost were mostly Democrat ones that had only flipped under Obama to be Republican Governors in Democrat controlled states. So a few flipped back to normal: Il, Nv, Nm, Mi. While many of the most important Republican ones that the Democrats promised were flippable to Democrat fell flat.
So in the house we saw weaker than normal Democrat/Opposition support, in the Senate we saw stronger than normal Republican/Incumbent support -- and in Governors we saw a shift that put them mostly back to normal representation. This was far from what the FakeNews had promised, especially when you look at the big money races.
(3) Local versus National - it is highly normal that people vote Democrat for local Representatives, and Republican for Senators/President. Your State/Federal Government is all about what can they take out of your community and give to the fed -- while your local government is all about trying to get back to your community some of the money/power that the federal government took away. Or at least that's how many think or feel about it. It's not completely true -- but it's typically how people vote. Governors work sort of the same as State execs as Presidents do federally: are they Democrat and wanting to centralize more state power at the cost of local control, or vise versa?
However, it's important to remember that elections are often local and personal. People will vote against their interests if they don't like one person or like the other. They will often vote the incumbent just to keep the status quo (even if they don't like it -- but like the alternative less). There's a lot of little local issues or personality quirks that can flip folks. And many places like Massachusetts, Chicago, or the coasts will just always punch the ticket for the most corrupt and inept Democrat in the race.
- Taylor Swift unwisely tainted her fairly non-political brand with strong support of Tennessee Gov Phil Bredesen -- and he lost significantly. 
- Barack Obama came out and campaigned for Indiana Senator Joe Donnelly (lost), Democrat candidate for Governor Richard Cordray in Ohio (lost), Democrat candidate for governor in Florida Andrew Gillum (lost), and Democrat candidate for governor in Georgia Stacey Abrams (lost). Those were the big ones that were purple places the Dems wanted to win. The exception is blue-purple Nevada race Rosen/Heller that might break his way. The safely blue places he showed up didn't flip red -- so while they didn't gain ground, at least they didn't lose Illinois, California, Virginia, Pennsylvania or Wisconsin -- but it's practically impossible to lose in most of those.
- Hollywood histrionics about this being a matter of life or death , their candidates matched Obama's, and mostly flopped. Even Oprah was unable to save Abrams.
- The most important races like Beto in Texas, were the biggest losses for them. They threw everything at them, and they're not winning the culture war with the hearts and minds of most Americans -- just the coastal lefties, media and fanatics.
(6) The Kavanaugh Disaaster - Schumer/Feinstein's Kavanaugh stunt cost them the Senate. The Democrats that made the biggest stinks and voted against Brett Kavanaugh, all lost: Donnelly, Heitkamp, McCaskill, Nelson. The one Democrat that voted for Kavanaugh survived (Manchin).  So the Democrats and their Press got their pound of flesh in the most vile Supreme Court Stunt since FDR tried to stack the court... even surpassing Bork and Thomas. But the voters seemed to have held them accountable for it: or 5 for 5 (1 in 32 chance) was just a pure coincidence.
Despite a strong headwind and historical norms, and despite a broken party -- with the Republicans being far more the big tent and divided party than the whip-cracking and herd flocking Democrats (that voted virtually 100% the party line under Obama), the Republicans fared much stronger than the media and left had been saying for the last 2 years. Way better than Obama or Clinton did in their first mid-terms-- but that's not how the Democrat media will spin it.
The Republicans lost in a few places -- but many of them were RINO's (Republican In Name Only). And a few of the Democrats that won or saved their spots did so by either being moderates or pretending to be. With the exception of a few looney's in places like the Bronx or Commieforinia -- and them playing the extremist foils to the President, are baking in an excuse for everything that goes wrong, which practically guarantees 2020 for Trump. (Though 2 years is a long ways away).
We'll have Pelosi and the Democrats (Waters, Schiff, Elijah Cummings, Ocasio-Cortez, and so on) screaming, lying and distracting with more of their #resist America campaign, and some faux impeachment (maybe) or investigations (at least). But all of that is going to convince sane Americans that the crazy democrats (their words) are not exactly toning down the rhetoric and uniting the nation. All of their agenda will be for Democrat Tribalism and intersectional hatred, and against Nationalism (uniting the country beyond race/ethnicity/tribe). So this may have been the best outcome for Trump2020 that he could have wished for. 
- Taylor Swift: https://thehill.com/blogs/in-the-know/in-the-know/410338-taylor-swift-breaks-silence-on-politics-supports-democrats-in
- Hollywood: https://www.breitbart.com/live/live-updates-celebrity-midterm-madness-your-vote-a-matter-of-life-and-death/
- Kavanaugh: https://twitter.com/TomBevanRCP/status/1060021713814073344
- Crazy Ones: https://www.dailywire.com/news/38045/here-come-crazies-nancy-pelosi-speaker-maxine-joseph-curl
- Gun Control Smackdown -- https://bearingarms.com/tom-k/2018/11/07/blue-wave-fizzles-gun-control-appears-fail/
1st Mid-term Elections
- 2018 Trump: -26(?)
- 2010 Obama: -63
- 2002 Bush: +8 -- but that was after 9/11.
- 2006 Bush: -30 was more normal
- 1994 Clinton: -52
- 1982 Reagan: -26
- 1970 Nixon: -12, but we'd just landed on the moon, things were going well, etc.
- 1974 (Ford/Nixon): -48 but Watergate
- 1966 Johnson: -47 -- this especially significant in light of Kennedy's assassination and Johnson's passage of "The Great Society"
- 1954 Eisenhower: -18, but Korean War might have made people a little more jingoistic
- 1958 Eisenhower: -48
- 1946 Truman: -54, but a little different as Truman had taken over for FDR, the war was over, people wanted less government
- 1950 Truman: -29, this was Truman's first mid-term after winning and not just taking over
- 1934 FDR: +9 (-14 for Republicans who lost to progressives, who voted with Dems), but Great Depression, later made worse by FDR's policies.