Y'know, I barely ever use Wrex and Grunt in ME1/ME2. Wrex didn't exactly endear himself to my original paragon Shep when he shot Fist without my consent, and so I was afraid always after that that he was going to pull that crap at later points as well (he doesn't, but still...) And Grunt I've always found a little... bland. Along with Jacob, I always have to force myself to take him along on missions. I guess part of it is that I've never been a big fan of warrior races in in SF/F. I've got the same apathy for Klingons, for instance.