Are geeksquad that bad? My dad uses them (although he's very far from being a technophobe - despite spending a lot of time missing MS-DOS) and has had nothing but a good experience as far as I know.
I mean, I guess they did fix her problem and I doubt youd have much trouble with them if you have a basic clue, but the people who need that service the most are the exact same ones that have no way to tell if they really do need this thing they're telling you is critical.
Plus I've seen enough online discussion about what techs employer unknown find on hard drives and how much their boss or 4chan enjoyed it to suspect that line of business may not have the strongest of ethical cultures.