The Republicans rightfully blame Obama on a couple of things, for example his Stimulus package didn't probably do too much, because it was pretty sparse.... Ultimately it caused a ton of debt, however.
But, in other things Republicans are exaggerating, or even wrong.
I.E
Obama actually deported more Illegal immigrants than Trump.
While, Trump maybe the most pro-Israel president, actually Obama is the second most pro-Israel president.
Yes, as you pointed out, Obama also spent a ton on military.
As for ACA AKA Obamacare, they're exaggerating, for example Obamacare is actually from Republican Romney, and it's not a lot more expensive, if anymore expensive, because the USA pays for emergency room visits for those who can't afford them, so ACA just supplements those costs, and even helps prevent emergency room visits by routine physicals.