You're projecting a view based on a personal agenda that, to me, does not fit with what really happened. Again, this past election's turnout featured a few key things that you are dismissing to make your point: lowest turnout in history, a set of circumstances where Dem seats up for election far outnumbered Repub ones and the election being midterms where Dems never do well to begin with, all of which favored the Repubs.
With that in mind, I really think it a bit of a stretch to consider the election a "clear rebuke of Obama and Democrats".