Was Jacen (ie Caedus) really that bad?
He cared about his family.
He cared about his friends.
Text from his PoV shows that he honestly believed that what he was doing was right.
Text from his PoV shows that he tried very hard to prevent himself from being selfish, and the bad things that he did were not to give himself money or power; they were because he thought it necessary for the galaxy.
Was he wrong? Possibly, but evil? Not really, although he did have to be stopped, since his plans would probably hurt the galaxy if he were to succeed.