Bad as in not-smooth or bad as in pot holes? I hope not the latter, because that's dangerous no matter the type of bike, and I haven't heard/read many people complain about the former.
My former housemate had some kind of race bike with a carbon fiber frame, it weighed next to nothing but he was constantly in fear of road debris, couldn't hop curbs, etc. It was a terrible choice for where he was actually riding.