I play fighting games with pads... CS being no exception, Litchi is very playable with a pad and I don't know why anyone would say otherwise.
Though for some it would be useful to have a pad with a 6 face button configuration and a real d-pad (as in what Nintendo and Sony systems use, instead of a fake d-pad on top of an oversized axis like M$ systems use), AFAIK there is no such thing. Even the Street Fighter 4 fight pad uses a fake d-pad. The fake d-pads are utterly unusable for fighting games unless you're still wet behind the ears... growing up using them and therefore it's what you're (unfortunately) used to.