Summer Glau shouldn't be acting, to begin with.
From my perspective:
- not attractive
- not skilled at acting
- looks uncoordinated
As a 'bad ass' in Firefly, I just couldn't buy it. A wooden uncoordinated actor made for poor immersion. Not nearly as bad as Kirk v. the Gorn, but still.
As a terminator, I could buy it as an emotionless machine, but not as one that would 'pass' among humans, and not as one that was particularly skilled at martial arts, beyond being indestructable.
And in neither case, was she eye candy. Buffie was much better at the femm fatale part (both in looks and grace), and the actress in T3 didn't look like she'd trip over her own feet, and was still a treat to look at.
But each to his own. I'm sure somebody enjoys clumsy looking wooden female leads.
Oh, and I stopped watching at the beginning of the season because so much of their trouble was of their own making. I couldn't watch I Love Lucy for the same reason. That and I discovered WoW, and can't be arsed to get away from the computer and watch tv.