It's pretty simple, you either vote for the nationalist or the globalist (like Obama, W, etc). It's not even about Dem vs Repub. I'm lobbing the molotov cocktail right at DC, TRUMP bitches.
Lumping Obama in with Bush Jr. is overly simplistic.
Bush Jr. was a buffoon, and effectively a puppet for neoconservatives with a malicious agenda (treat the world as a black-and-white, good-versus-evil war, even if you have to lie and cheat to do it). He set back relations with other countries, held back progress on LGBT rights and was partially responsible for the worst economic crisis in decades (I'm not exempting Bill Clinton from this).
Obama cleaned up many of those messes (as far as an obstructionist Republican House would allow, anyway), and brought back a level of decorum and intelligence that had been sorely lacking. He also ushered in a more technically savvy government with a relative openness that hadn't been seen before. His administration was far from flawless (it didn't take swift enough action to curb ISIS before it got big), but it was miles above where Bush Jr. was.
Here's the problem with Trump: throwing someone into office to destroy the system is fine...
when the person knows what they're doing. Trump doesn't. He's an incompetent business man. He's racist, sexist, hot-tempered, petty and he doesn't have the faintest grasp of how politics work. Remember, we know for a fact that Pence would be handling most of the real responsibilities of President. His tax plan is designed to benefit him; this is not a man of the people, for the people. He rejects widely established scientific facts like man-made climate change. Voting for Trump is the most irresponsible thing you could do.