I think for the most part, all of us are reading more DC now than before the relaunch so we're accepting change pretty well. Just about everyone has at least one problem with the DCnU though, and that usually relates to the past. It is very easy to just discount it as holding on to the past, but if your gripes are valid then so is everyone else's.
Personally I felt that WF and Helena Wayne was lazy writing, after some discussion I think it was probably just rushed. Either way letting go of Helena B wasn't going to solve the problem. With the new Shazam! and Billy Batson I feel that they gave the character to someone that had no idea what the story was. I have to let go of that idea to accept the new story. It makes it much easier to feel for those JSA fans that have a whole new story with the same names on Earth-2.
Both arguments are right, but if I didn't cling to the past I wouldn't care about Superman or Batman at all, and I would only read newer characters that still have stories to tell me.