I will summarize this up nicely.
If Bush did the EXACT same things, under the EXACT same congress, and everything were EXACTLY the same as it is now, only its a white guy named Bush in office, he wouldve been destroyed by the media, and would likely have not made it to a second term. If he did make it, and had something like bengazi happen(again EXACT same everything) he wouldve been impeached and wouldve had many many americans threatening his life.
Simply if bush were in office doing the same things obama did, he wouldve been destroyed.
But to answer the op question. Why do people disike obama? Just do a little bit of research and find out. There are plenty of reasons.
Saying "well at least we arent as bad as china or n korea", or "well hes only a puppet", still do not excuse someone from their bad calls. Saying when your house burned down "well at least it isnt as bad as my neighbors house" does not change the fact your own house is burned down. Puppet or not, Obama can still choose to do the right calls. He isnt forced to obey his master. He is only being manipulated.... should not excuse someones acts, good or bad.
Hitler was a puppet. Does that mean its just fine that he caused the holocaust? (just a example....just because someone is a puppet doesnt excuse their actions.....good or bad.....if someone is a puppet, then their master and themselves share the blame. Both are responsible for whatever happened.)
My opinion is that both bush and obama get blamed for many things that were not in their control. However there still was plenty in each of their control that they both still screwed up. People tend to forget the president is not all powerful, and tend to forget just how much power congress has.
Congress is mostly responsible for many of the negative things.(just one brief example, that is often forgotten....the war in iraq was only possible because congress approved it. If they did not, no matter how much bush may have wanted it, it would not have happened. Also at the time, many many people supported it at first. Then the truth sunk in about how futile and costly it was, then people automatically blamed bush entirely, instead of the congress people who approved it. "And only congress shall have the ability to declare war".