It may very well work "really good" but that doesn't mean the information you've been given is not valid.  Maybe you don't care about the licensing aspect, which is your right, but promoting a fancy GUI here in the face of cg's developers is probably not the right move.  As others have stated, cg has plenty of features and the software your are promoting is likely taking advantage of them in a pretty package that while it may be easy to use, doesn't necessarily add anything (hard to say without code being available).  Instead of saying you don't think cg is the backbone of this software, maybe ask some questions so you can understand what it is you're doing wrong and why people take issue with it.