I actually just made a traps mm, and they are quite fun, more so then i first believed. So far he's doing pretty well, all trap powers seem useful. Poison trap is especially nice, even holds bosses half the time.
Have mercs, plan is to run right in and use detonator, while the survivors are being shot at ill place some trip mines to finish em off, should be very nice damage. Still just theory though.
Im pretty damn durable at the moment, damage is so-so, altough i did just get the commando so it has picked up a bit, still need to slot him though.
Medicine pool was a great choice (both aid other and self), combined with triage beacon.