Well, judging Simona only on sheer results can be rather misleading. She did the majority of her races on cars that were basically falling into pieces - she had to do most of the 2011 season on a 2003 chassis, no matter how ridiculous this might sound. Being in a 1 car team doesn't help at all when you're unexperienced, and HVM has constantly been lacking of ressources. On the top of it she got a couple of injuries due to bad crashes, which left her completely demotivated(after she recovered, she even said she considered leaving the sport at some point).
But anyway. Just look at her first races of 2011, in which she had a proper chassis. St Pete, she starts 17th, climbs to 2nd thanks to a few great restarts, then falls back to 4th due to slow pitstops, then harasses TK for 3rd until the end. Barber, she finishes 9th despite getting taken out at a restart. Sao Paolo(in the wet), she gets taken out at the start, drops 9 laps down, but then sets the fastest lap, and matches the leaders' pace. Then, she had that big crash at Indy due to a suspension failure, which broke the car, so she had to get back on the 2003 back-up chassis. No wonder why she was doomed to stay in mid/back field afterwards, but she still pulled a fine top 5 run at Baltimore, which was sadly ruined by a Safety Car coming at an unlucky timing.
Sorry for the shameless fanboy tone, but it is clear that she has an enormous potential. Give her a decent race car again and she'll repeat that early 2011 form. She only needs to get up to pace on the ovals once for all, but since their future in the series is rather uncertain, this might not be such a big issue in fact.
Ana Beatriz. Well, I've read that the engineer she was working with this year has quite a bad reputation. Sure, her first season half was quite bad, but she had a couple decent runs afterwards. She looked half-decent in feeder series, so she deserves another chance maybe. She might go back to Brazil racing Stock Cars in 2012 according to some rumours though.
Pippa Mann. She's a lovely girl, but her talent is indeed a bit questionable.
And back to our topic, Katherine Legge. She was great in Atlantics. Can't recall much of her 2006 ChampCar season, but she had some great runs and even led a few laps at Milwaukee IIRC. 2007 was awful, but it was mostly because Coyne didn't have enough ressources to put a decent second car on track, so her season was plagued by technical issues. But yea, she was definitely very underwhelming in DTM. We've seen worse ride buyers than her over the years though, so I wouldn't really be "shocked" if she indeed gets a seat. The announcement was due to come last week though... Strange.
But yea. Would be a shame if we lose Servia and Lloyd. AFAIK Servia is still backed by Telemundo to some extend so he could still find a ride somewhere. Not sure about Lloyd, not much has been said about him recently. Anyway (correct me if I'm wrong) if we lose him it'd be the 3rd Rookie of the Year in a row disappearing after 2-3 seasons, after Mutoh and Matos. Never a good sign.
Edit: Oh, just spotted that:
Her earlier open-wheel performance was a bit better than Legge's though.
For Kat's defense, the field was much tougher when she was in Atlantics - and she still got a couple of wins. OK, Simona got more wins and poles than anyone else in 2009, but the series were dying completely, as it had no real point to be after ChampCar's death. Grids weren't bigger than 12-13 cars IIRC.