Me personally I don't hate Millar, although some of his stuff just involves certain things for the sake of them being there. He's talented, and can write some good stuff, but mostly when he takes on established characters he does so in a way that doesn't fit, civil war is a good indication of this. His Ultimate work is pretty good, but since no one really cares about that universe if there's a piece of good work there I think that's great.
His current Ultimate U stuff is good (to me) and even kick-ass was good, but Millar is a guy that shines best when he writes his own stuff. As for originality, there is no such thing imo. Once the door is open it's open. Everyone has a punisher, a hulk, some type of billionaire hero, and most importantly the Jesus archetype figure that can do any and everything, and those are just a few types that come to mind. His work can be hit and miss, but business is business and everyone needs money. So if he can get his shine on, then let the dude shine.