I think the problem I have with the other two is that they are very one-note - Summer Glau almost always plays socially awkward/crazy and Nathan Fillion plays pompous ass. Both of which they do very well, but it's pretty much all they do, and I find both of those character types annoying.

The only character either of them has played that I liked was Captain Hammer, where it was obvious Fillion was playing up the pompous ass stuff on purpose, almost a self-parody. (It also helps when he's the villain and I'm supposed to hate him.)