Most of the criticism I see is due to the drone strikes, but those people also almost never mention Bush's war crimes too.
The way I seen it, Obama knew he had to be tough on terrorism or else the Republicans would pull the whole "Dems don't care about protecting us". So he ordered for Bin Laden to be killed and drones to be used to eliminate targets without sending waves of troops like Bush did.
Was the plan perfect? No, but no plan in war really works out perfect but you are a fool to think Bush's Sr/Jr boots on the ground plan was any better both in terms of cost of resources and lives.