I've had very few bugs Elidroth, besides the whole steam thing, and the occasional drop out of the market place. I did have a mission last night that fucked out when trying to kill some dude and had to restart it. Escort missions are absolutely shit, they really, really need to work on that pronto or just remove them for the time being.
The instance type missions are some serious fun.
The first Thump I did with Grimsark I planted a Personal Thumper I, designed for 1-2 players, and it was a cake walk. Engineers do extremely well as point defenders, so long as they use the ammo/healing station (lol grim) they do pretty well. The Adv. Engi frame "Bastion" is an excellent defender. The second one I put down was the Squad Thumper I, designed for 4-5 players. Shit got scary fast and we got into some serious trouble. I think if we'd had a ammo/health station down from the Engineer, we'd have managed to finish that Thump (got it to 85%). Pretty sure that Grim had never seen a proper Squad Thumper and was caught off guard.
Night time and day time can make things much more interesting as well.
So far, Iron and Tungsten have the same refine rate from ore to crystite, so there really is no difference in Thumping low level zones for materials. The difference is in the xp generated, if the area is too low, you get no xp for the Thump at all. I've still yet to check if you get mob materials and salvage from grey cons.
I main the "Firecat" assault frame, which is primarily an AoE skirmisher, excellent at clearing waves of mobs with precise shots. The Tigerclaw has less AoE splash, but a higher damage mod on a direct hit. It's also even faster and can stay airbourne longer.