I'm slowly plowing through this. Haven't seen too many bugs - a couple of minor glitches like dialogue options showing up twice and annoyances - transitions to "aimed shot" mode being super slow. Other than that, it's a fun time. I seem to be pissing off everyone but the refugees and the "Monster Army". Maybe it's because pretty much everyone else is an asshole. "Leave those refugees in the cold.", "Transplant this AI into a guy's head, overwriting the guy's brain in the process.", "Kill this synth that didn't really hurt anyone and bring me its CPU.", "Track down my escaped slave.", "Kill everyone in this location who hasn't really done anything wrong." etc.
As someone pointed out earlier, the difference between starting combat and not starting combat is huge. If you start the fight, you can start in cover and take out a couple of guys. If you don't, the bad guys start in cover and take out a couple of your guys, as armor seems to make about zero difference.
Handguns are surprisingly useful. I've got one guy that has a high tier pistol that does more damage (60-100 or so) then a burst from an AR, and can fire it off 5 times (it'll be 6-7 once I get coordination to 10) per round depending on whether the "lucky shot" thing pops. There's a perk that lets you take a 0-ap shot after reloading the weapon. With the right magazine mod, you can reduce reload costs by 1 AP. So what does that mean: Fire a shot (3 AP). Reload for 1 AP. Fire free shot. Reload for 1 AP. Fire free shot. Etc. With 8 AP, that's 5 shots per round. I'd say it lacks armor penetration, but the amount of damage it dows punches through any armor it encounters.
Sniper rifles are pretty good, too. Hang out in the back, "mark target", then hit it. Recently picked up a neutron blaster, which zaps robots pretty good. Only problem is that I have three people with energy cell weapons, so I have to moderate my usage of those.
Heavy weapons seems like a cool investment at first, but .50 cal ammo is rare and expensive, as are rockets, while flamethrowers don't really do enough damage. So I don't like them. Good thing the heavy weapons person also has leadership and explosives, so she can hang out in the back and buff the team or chuck grenades.
Also found a crossbow, which is an interesting weapon - does minimal damage but at the end of the bad guys's next turn, the 'explosive bolt' buff goes off, doing pretty good damage. It's got a pretty good refire rate, so you can blast multiple targets with it.