Well, I'm back after putting this game aside for a few months. I love the balance changes; the early missions are quite difficult now that the alien weapons have some punch to them.
I can get behind the argument that it's a Hollywood depiction of military combat, not a realistic military simulator, and not even a JA2-level depiction of military combat. Every absurdity in the game that involves sci-fi magic can be excused, even the paltry ammo limits for the laser-and-higher-tier weapons, and the fact that you can recover an interceptor that has been obliterated into a million pieces (maybe the magical alien alloys can be put back together again). But after all of that, it still seems weird that you would only bring 60 MG rounds into battle against freakin' aliens.
EDIT: Yeah, the MG definitely needs to have it's accuracy halved. It should be there to provide suppressing fire over a wide area, not to instakill at long distance.