People forget, if you saw a giant green man, in real life, lifting a tank, it would look "fake" to you.
I have seen so many real, actual decayed human corpses that look SO much more fake than corpses you'll see in big-budget Horror movies, CSI, etc.
I hated the design of the Hulk, 'cause Ang was so concerned with humanizing him that he said "Don't make him look like a big green ape.", but that's what he LOOKS like! So there were shots where he had a BABY-FACE.
But as far as "fake-looking", the only parts that looked really fake to me were when he was a little spec "flying" after a jump.
Thing is though, that's what it would look like, if you ever saw a giant green man flying through the sky.
But all of this is irrelevant. I think most agree that Gollum looked amazing and was at least cooler than a skinny guy in a scuba suit with an animatronic mask on, and EVERYone seems to agree that the squidhead in the pirate movie looked really real (I don't watch pirate movies, so...)
And I never said, "They should've done the Thing with CRAPPY or sometimes PRETTY PASSABLE CGI!

"
I'm saying that you can't do the character effectively without superb, state-of-the-art CGI.
If you can't afford it, don't make the movie. Wait till technology improves and gets cheaper.*shrug*
To finally see the Thing in a movie, stretching and fiddling with his rubber fingers, and with puny human proportions was heart-breaking.