Sorry, i've just been pretty miffed about it in this game. I know there's a mod that enables crits outside of VATS, and Overdrive does the same thing, so surely making a 100% crit chance Alien Blaster wouldn't be a big deal right? it came from a freakin crashed alien ship for crying out loud, it's not exactly 'realisitc' I mean, who cares? single player game first of all, and second, it's just a silly ridiculously powerful almost joke weapon.
I don't see why they toned it down so much in this game, i guess they just didn't want to give players an 'I WIN' button, but that's why it has always had extremely limited ammo, which is still true of it in this game.
in past Fallout games it was always this super powerful weapon that had a 100% chance to crit.