I think the absolute worse thing that bipolar does is it clouds your judgement. When you're bipolar you frequently make the dumbest decisions.
If it was simply a mood problem, it would be easier to handle.

But it's a disease that can make you lose everything you've worked for and everyone you care about, if you aren't very diligent.
So, what's the problem with being manic? Nothing, I guess. It's the crazy stuff you'll do while being manic that you'll regret later that's the problem.