I've soloed it so far and it's very manageable with only hammer elites causing any real difficulty. As long as you don't put yourself in a position where you can be got from behind or flanked easily, most missions play out the same. The turret can be a great deterrent to stop flankers and the drone also helps. I think most of the few deaths I've had is where I've glued myself in cover and instead of coming unstuck, I've moved around into the open whilst still attached to the cover surface. Having a OHK sniper as a secondary can be very useful and enjoyable too.