I don't know. I connect with Rand, too. Mostly because I feel so sorry for the poor guy, and his emotions really are quite complex. They just aren't normal. And, as Jason from Dragonmount said, they just continue to get worse. Jason's review states that there is a scene in the middle of the book where Rand hits a new low, or something like that, and that the emotions Rand is feeling at this point were among the most deeply interesting points in the book. That's all paraphrased, FYI.
Mat, I agree, is the only one of the main 3 who still has regular emotions. Perrin..... A little of his slow but deep thinking from the beginning would do much to salvage his character for me. As is, the one word the best sums up Perrin's thoughts is Faile. Hopefully, now that she's back we'll begin to see some real character development from Perrin again.
While the main 3 do seem to have slowed in how they change, they still have the opportunity for lots of character development, and they are all still changing. Just not as noticeably as before.
As a side note, there are several other, smaller characters who also have fairly good character development going on at the moment. The best example I can think of right now is Nynaeve. She's had her whole "Learn to be Aes Sedai" arc, and she's had her "be annoyed at everyone else and find out that I'm not inherently superior just because I'm Aes Sedai" arc. Now, she gets to show us some of her motivations for following Rand around, when she could leave whenever she wants, and we get to see her move slowly from being a whiny, annoying girl to being a much more dignified and controlled woman. She's becoming an Aes Sedai in truth.
We saw much the same thing with Egwene earlier. Now Egwene is developing from an Aes Sedai to the Amyrlin. I expect we'll get more character development from her in the next book that will make it very interesting. After all, she'll have some very important decisions to make, and the results of her actions will affect at least all of the Aes Sedai, if not the rest of the World. That's the kind of pressure that's been working to (at least in part) drive Rand insane.
Now, granted, there are other characters who don't change much. Elayne is a good example of this, which is, I suspect, a large part of why so many people find her so annoying. Faile and Lan are also good examples of this, though Lan may be getting some development sooner or later. Especially when he finds out that Moiraine isn't dead.
The Seanchan are getting more and more development as a whole, which tends to be very interesting as well. The more I find out about them, the more I like hearing about them.
So while character development in this series has slowed, it really hasn't stopped. At all. It's just moved to other characters who didn't get developed as much. I'm sure there are others that could be named that I haven't really been discussing. The point is, while the huge events in the series may not be affecting the characters as much as you think they should be, they are still affecting them. Some of the main characters have seen pretty much everything, and would be hard to shake with even the largest of events. The smaller character changes are probably a result of that.
Wow. Sorry for the incoherence of that post. I've been reading Act I of Hamlet, memorizing virtually every Trig identity known to man for a quiz in Calculus tomorrow, and reading for AP Gov. My brain really isn't thinking very clearly. If you have trouble following me at some point, just ask me to clarify, and hopefully I'll be able to think by the time I reply.