The guy is an average rebounder. Isn't a good post defender. Has bad hands. No offensive game at all (shooing, passing, post, etc,). Bad feel for the game. Uncoordinated whenever he has do anything that involves the ball actually being in his hands. Has he even improved at all since he left Kentucky? That's a legit question.
I think people are fascinated by the fact that he looks like he should be good rather than what he actually brings to the table. That said, trading major assets would mean you're basically forced to overpay for him next summer. Unless of course you're happy trading away those assets for a 1 year rental of a marginal player.
This is the crux of it. Some people don't know what the hell they're talking about re: Noel. It's either crap analysis of his on court value like the above. Or it's crap analysis of his market value and crap understanding of his free agency situation. I give up. It's not worth haggling over on an internet message board. People are set in their ways/biases on the subject -- already, within days -- and no amount of new information or reasoning will fix it. I rarely come to that conclusion.
Here's the solution: Wait. That's all we can do. As I see it, there are four general possibilities, and two of them are good for the Celtics. 1. Brown is good, and so is Noel, in which case there might be quibbles about team need but can be no complaints about Brown. 2. Brown is good, but Noel is not. Yay, we made the absolutely correct call and the Celtics front office can gloat about how their rivals and even their own fans were wrong. 3. Brown is not good, but Noel is. Yuck, we screwed up. 4. Brown is not good, and neither is Noel. Oh well, wouldn't have made a difference. I expect Noel to be good. I'm rooting for the first scenario. We will know who's right in, oh, two years or so.