Gotta disagree with the majority here. I'll admit, those pictures make them look pretty bad, but the photography is sub-par. Check out
General Hawk's pics to see them photographed much better. The articulation is a little weird in places, and they do look a little on the thin side, but... Their heads! Their bright colors! They look like cartoon characters, and I love it! I do think the painters got carried away with the giant eyes, but I doubt the final products will look like that.
Cobra Commander is a masterpiece, and Destro has really, really grown on me. His head doesn't look as tiny as the original proto shot that we saw. Duke's head looks a lot better than the proto too, and I really like Scarlett's head. It looks so energetic. Also, it almost looks like Cobra Commander's helmet is removable! Possible hood accessory, anyone? The trooper's helmet looks like it might come off too. Still can't tell about Gung-Ho's hat though...
Anyway, I was a little let down after those first pics, but after seeing Hawk's, I'm psyched again. But I think we've established that I have different taste in G.I. Joe than a lot of the rest of you, so I'll be happy to agree to disagree.