Bad things about what? Windows Phones or 4S's?
My 4S is fine. It's an apple product, and you get the good with the bad.
Windows Phones are still really new. However, I've talked to one person who uses one and she loves it. By the end of the year I expect there to be some more options and better options. However, right now the Lumia 920 and the HTC 8X are the 2 leading options and CNET has reviewed them both and they both score well.