Nah, she was still really annoying. She wasn't as bad before she regenerated, but her whole regeneration sequence was annoying. Maybe her character wasnt as annoying in the episode (any other character and it would have been a fun nazi terrorizing romp), but since it was based around shoving her down our throats some more, overall it made me hate her more.
[spoiler]Also the whole gun/banana/loaded/unloaded thing was OK, but she just happened to be carrying the uberdeath poison, had it on her lips, which survived her regeneration, and doesnt effect her but transfers with the slightest touch...[/spoiler]
Actually, on whole the medical things of Dr Who always annoys me, presumably the tardis should have cures for pretty much every disease ever, and the most advanced medical life support systems possible, but at best the 'doctor' uses whatever crap he has on hand in the time of where he is, and is surprised that people around him die of simple stuff all the time. Granted, they cant just have him swoop in with the super duper phoenix down all the time, but they could at least make some effort to somewhat explain why he almost never can heal anyone of anything.
Kinda like weapons and Torchwood, specially in season 3, where they have their big super tricky plan to finally force everyone to let them have a confrontation with the evil aliens since they're the experts...only to just shoot at it, and fail, not even because of highly advanced alien technology or interference or anything, just cause there was freaking bullet proof glass there...I'm just waiting for them in season 4 to try and punch the miracle (not whats causing it, just the concept) to death.