Why Is Hamlet A Tragedy?

I don't really like any of Shakespeare's writing and would consider all of his writings real tragedies... However, I don't think that is the kind of answer you are looking for. When I read Hamlet I simply hated the main character. He is very slow in making every major decision. Every action that he does is delayed. Clear up until the end, Hamlet doesn't know for sure if killing his uncle for revenge would be morally justified. Can I please say SLOW!!!! I mean 'come on and just make a decision already. Of course all of his actions would have a great consequence on the kingdom which could in fact end badly. So I guess I can kind of understand why the decision processes is a little backed up, but as a reader it can get kinda boring. And then at the end of the play, it's not even clear to me if everyone got their proper justice. What a sad story indeed, I guess that is why people call it a tragedy.