I dunno, my doc's pretty cool.
I really only play fighters (usually more dex than strength), rogues, and magic users (and even then, only evocation and necromancy) in D&D. In shadowrun, I can only really see myself playing... essentially rogues of various flavors until we all get hacking settled out. Right now I have a speedy tweaker B&E guy and a street doc who's... pretty much an assassin. (WHOOO REPO!) It's my niche. It's what I like to play. I wouldn't really enjoy playing anything else ('cept maybe a sniper) so I'd HATE a GM that would make me tank. I do not WANT to tank. I would not know how to THINK like a tank. Do NOT make the party suffer by making me tank!
It's kinda the reverse in Battletech. Give me assault mechs or I will give you lots of stupid decisions that end up getting all these lights and mediums killed. I have purposely run a locust off a cliff because I hated the damn thing so much and saw no point in running it. I was all jacked up on flu meds at the time, but still. I play more like a slightly mobile turret in BT than like something that actually has a move rate.