I agree with you. Sometimes shotblocking gets mistaken for defense.
Thabeet right now is worth 10pts to his college team just on defense alone. He is the anchor.
Seriously, I think some of you are living in the past on this player. You watch him play today, and the shotblocking is the least of his defensive impact. People are terrified of him, and they should be. Like all great shotblockers its the 2 shots he intimidates for every shot he actually blocks that make the real difference. He just lurks back there, and guys change their mind before they ever get around to shooting. Half the time his own man won't even look at the hoop. I do see the times when he does not challenge, but it seems pretty clear to me that that is a college kid trying not to pick up cheap fouls, and tyring to keep his own man from getting an easy dunk -- that is the sophistication I mentioned earlier. This is not a guy who blocks 4 shots a game by chasing every shot and hopping around everywhere -- he blocks 4 shots a game EASILY, picking his spots, letting things go that he does not think he can reach. If he wanted to chase everything he'd probably average 6 at least, but be fouling out every night. As it is he plays within himself. He also is 7'3" yet quick enough to show up top on screens and recover back down to protect the paint.
Nor is he "raw" or all this bunk either. His offensive game is limited, but it now has structure. Simple but sufficient -- get position, lock the defender, wait for a lob for a dunk. Its not much different than what a Chandler brings. Not only that, he shows some potential for a little face up jumper. The form on his FTs is good, and he had a good looking stroke when he ventured out there against Louisville. And he simply does not look lost, confused, or awkward out there like the truly raw guys we ahve seen over the years. On the contrary he increasingly looks like he knows exactly what he wants to do out there and he's actually causing teams to have to collapse their defense to prevent it. He will never be a primary, or likely even secondary scorer, but who cares? That's not the point with a player like that. He already has an idea of how to play a role on offense that teams have to account for, and that is seriously enough. Put him wiht Chris Paul and I am not sure the results on offense would be much worse than they are for Chandler.
Throw in that he's bulked up and started to get very physical setting picks and on the glass and you have a player who has come a tremendously long way in 3 years. Two year old scouting reports have nothing to do with the player who has been taking the court as this season has progressed.