My brother is in the beta, today he told me he had the following three opinions of it:

"It's a WoW clone, but it's decent for a WoW clone";
"It's basically KotOR crossed with WoW";
"It's better than I was expecting, but still mediocre"

Obviously his opinion is just his opinion, but he is a longtime MMO player/WoW raider and a KotOR fan so I'm inclined to put some stock into his judgment.

As for me, I'll still wait and see. More and more I'm feeling done with MMOs until Blizz's new secret project.