This question isn't nearly as interesting for BIA as it was for Jagged Alliance 2, which had a lot more personality and the skill development was more meaningful; but I'm curious about your starting squad. I went with Grunty, Malice and Igor (who only joined after Grunty did) and it's been a solid team even though there is really low medical and mechanical skill.
Malice got some vital early stealth kills, Grunty has done low-level healing and I gave him the best rifles for long-range use, and Igor has been heavy backup for Malice in case stealth attacks go wrong. It's not a great team, but it's worked so far (except for the SAM site referenced in another thread), especially after finding some lucky weapons caches and diamonds.
I'm just curious how you started your teams, and more importantly, if you've already restarted, who did you select based on what you learned?