In the past two decades I've watched election, the party opposite the president of the WH wins the off-year local/state elections, because the opposing party is more motivated to vote. This was true under Obama and Bush and Clinton.
Imagine how terrible it would have been if Dems didn't uphold the expected trend? No one is even going bat an eye at these results. This was the expectation.
That is not true. What happened in the Virginia House was totally unexpected. In raw vote totals, the Virginia House which was 66-34 Republican is 48-47 Democrat with 5 seats outstanding. In raw vote totals, it is 50-50. That means at least a 14 seat pick-up. Also the margin of victory was not expected. Trump lost to Clinton by 5 while Gillespie lost by 9. Also the Democrats did much better than Clinton did among blacks and women.