I think people are probably having some problems with all of this new cars that are coming out because they are new! I hear people complain about the pro4, tc4, and may others at the track. I think it is just going to take some time for everyone to understand how their new TCs handle so that they can get a grasp on setup.
I'm new to touring cars, but I am sticking with my tc3, partly because I am broke, and partly because I am just happy with it. It is one mean, cost effective touring car, and it will still put the heat on all the other cars at the track for years to come.