Asa, don't think the Hulk is a disaster waiting to happen at all.
And as far as saying he is overrated, well, care to explain why you think so Humble?
The way I see it is that he has tons of pace as well as power. That's exactly what you're looking for from any attacking player in the Premier League. Technically he is first class. Possesses some very neat/tricky footwork, has a mean shot and is not afraid to shoot. His free kicks look a lot better than anything we've got here. Plus he's the right age. Don't know how he is defensively, but the impression I got from watching him is that he isn't lazy either.
Look at it this way. At least we know his brain won't turn into mush once he has to deliver that final ball a la Gervinho, and he won't trip over himself like a certain Walcott trying to run with it. Would be a coup if we signed him if you ask me.
Unfortunately we don't do signings like that. He'll probably move to Spain or Chelsea for big money.
