I wouldn't go that far. I think Glau can be good, but they force her into emotionless roles. She was quite good in The 4400. She had a decent role in The Unit as well. She isn't near as bad as Garner.
As for canceling Dollhouse, I don't like that it is being canceled, but with only half the episodes being worth a damn, I can see why they are doing it. It seems like it took the announcement of the show getting canceled for it to start going anywhere. I also think that it's time-slot is poor, and that is leading to a false perception of poor viewership. Am I sad Dollhouse is being canceled? Kinda. More like I am upset that these types of shows have such short life-spans. Terminator, Dollhouse, Firefly, Fringe (in danger of being canceled), 4400, Kings (alternate reality) etc. All this does is set a precedent that all SF shows are poor. Some of them may be, but not all of them. Instead, they will make a cheap "reality" TV show because they are worried about the public's perception of SF shows or original IPs.