I am a huge fan of real models, and am often pretty harsh on CG. However, I really think complaining about the CG is missing the point. Not too long ago my wife and I watched our way through the entire series of Firefly for the second time. I couldn't help but notice how dated and crappy the CG models look, I don't remember noticing that the first time I saw the show, which was only a couple of years ago, so the CG was still quite dated at that time as well. Even though I noticed the crappy CG and how bad it looked by today's standards, it never took me out of the story. Why not? Because it is just a special effect that is assisting in telling a story. As long as the story is good who cares, old stop motion effects in movies don't bother me, and old CG doesn't either. But when the story sucks or is poorly delivered and the CG is the only leg it has to stand on... well, ouch!
There are examples though where it feels like CG is used just for the sake of using CG, or almost out of laziness, the clone pilots in Ep.3 come to mind, why would you use CG for a person? You'd never get away with showing a shot of a CG Anakin in the cockpit of his figther, that would be insane. Why is it so forgiveable when it comes to the clone troopers? Because they didn't want to bother getting the actor who played Jango back to film a couple more scenes? The infected in I Am Legend are another good example, we had the potential for a pretty interesting movie, but I feel that the over use of unnecessary CG knocked the quality of that movie down considerably.
If the new Trek bombs, or if it is successful but bombs in the eyes of fans, I am certain it won't be because of the CG. I wouldn't care if this has the worst CG models in the world in it, if it is good in all other regards. Using ILM for the CG is not a bad thing, they are awesome at CG. You can't say the CG models in episode 1,2 or 3 look bad, because they don't, they look great. Even Jar Jar looked pretty amazing, Jar Jar's problem was not that he was CG, if he'd been played by a guy in the costume, he would have been just as bad, and probably quite worse. Same can be said for Grevious and other all CG characters.