Republics hated it and fought against it.
And Republicans fought against it because the wrong party/person proposed it.
After 2010 midterms he couldn't really do anything, because the GOP did everything they could to obstruct everything, seemingly mostly just as a nihilistic power game. If you will recall, even very simple and uncontroversial appointments were being blocked. It was absolutely ridiculous. I don't especially like the democratic party, but there is no real comparison. Both a forceful push and several punched to the face are assault, but clearly they are not the same or "every bit as guilty".
In the first two years, when he was actually empowered, he mainly focused on the financial crisis and the ACA. Those two were already massive undertakings.
Also Afghanistan was not "Vietnam 2.0". About 280,000 US troops died in Vietnam. About 3,500 coalition troops died in Afghanistan, most of them in the early years. 2020 saw 11 casualties. Comparisons to Vietnam are profoundly unserious. There's a reason Obama stayed in Afghanistan: it was relatively cheap and kept an enemy (Taliban) in check. Now, you can agree or disagree with that, but it's really not as straight-forward as you're presenting it.
When they tried to force Hillary Clinton down everyone's throats in the most rigged primary I've ever seen, when Kamala Harris skipped the primary entirely and was just plain anointed instead? Voters care about that shit too, so you can't claim "overthrowing democracy" is the exclusive of the GOP. In both cases, the election was theirs to lose, and they lost it quite actively.
When the new crowd (AOC etc.) get introduced to Congress and are immediately told "these are the corporations whose interests you are supposed to stand for"? Voters remember that, so you can't just claim Trump is more corrupt than anyone else.
Or to take a step back: In 2008, Obama got elected on a promise of change, but by-and-large just did more of the same. Trump withdrew us from Afghanistan disastrously, but he only had to because the actually-competent people had refused to for over a decade, even though America was already sick of Vietnam 2.0.
Now, I do think Trump is a very bad thing for the US. But he's only a symptom of a problem that has gone unaddressed for a long time.