I think if people have a problem with a certain TPC, you should go to another one. There are a ton out there. Then if you hate all that, then just go with the 2x2's. What's the difference between a dealer who's been doing it for 30 years of PCGS? The difference is your opinion of there grades.
In the end, just b/c you agree or disagree with the grade of a certain coin, when you go to sell it to me (or another person) I still have to agree with your grade of the coin (or that on the slab).
My favorite part about
TPG's? That the coin is genuine. I don't have enough experience with coins yet to tell the difference between real or genuine. About the only thing I can tell (that's difficult) is the
LMC small/large date for the 60 and 70. But if I'm at a show and I happen to catch a good deal on a coin that I know my father needs for his collection, I'd feel better buying one slabbed than in a 2x2. Now I know there are people that can pick out the real from the fake and this benefit might be worthless to them.
Just my 2c.