I actually really enjoy this show and I'm glad because despite the fact it ultimately became Teen Titans replacement and IS a super hero show anyway, I think it's one of the most original plots and stories I've heard in a while on TV.
The concept of the alien watch is brilliant and the show's aliens are certainly far from bland. There unique, there powerful, and they keep evolving as the show does. Ben 10 started out sloppy for me in the beginning of the first season.
It was suffering from poor dialouge and cliche situations, but they've evolved with impressive episodes in season 2 and seriously stepped up the "creativity" bar by keeping new ideas freshly mixed in with old returning characters.
I really hope the show continues to do well, and regardless of the fact I'm 22 and watch a kids super hero show, I still enjoy it every chance I can watch it.
Just wish the show would lay off the male bashing (Ben) once in a while.