Gotta separate your two thoughts here cause there's a lot going on.
Here are some things that are Obama's fault (IMO): Droning Anwar Al-Awlaki without trial, killing Al-Awlaki's son without a trial, hiring a loser like Geithner for the most important job in his first term, not taking SIGTARP's findings seriously at any point, signalling that he wanted to do a Grand Bargain over the debt ceiling in 2011 instead of holding firm for a clean increase, not filling all the fucking seats on the Fed Board of Governors, and there are probably some others but those are the big ones that stick out to me.
As for blaming Bush, the things Bush did will always be Bush's fault. Some of those things are fixable and have been fixed (OBL is dead now), some are fixable and have not been fixed (the labor market still blows), and others are broken forever (some detainees are un-triable because torture). The things W broke forever, it's on Bush that they're broken forever. And then some things require congressional action to fix and it's important to remember that congress is composed of adults with free will and agency and not some thing that Obama can force, trick, or cajole into acting in a way it doesn't want to.