Never put faith in a developer. Most developers have made a bad decision or two and character balance is a mistake nearly every fighting game developer makes. A good patch after backlash will be just fine, however. No need to actually worry about it.
I agree that people can gt better and beat others, I never would have believed i'd be mosly playing as fat princess AND winning as her, She gains AP slowly but a lot of her moves can really punish if done right. But i alos think Kratos' Blades reach is just that little bit far, Yes you can block and roll on ground, but you get 1 Air dodge and his blades always home in on you, couple that with a pretty fast AP gain and you get the people complaiing about him, He just needs either Less reach for his chains, or a slower AP gain. Other than that everyone is pretty balanced. I haven't a clue on why people think they can't win with sweet tooth either, I usually only lose to parappa's with him!