I hear and respect your points.
But I just want to say, "meh" to the Berserker. The first two in Gears 1 were indeed fun. Granted, I saw the second one coming a mile away, but both were fun and a bit of a challenge to take down. The third seemed like a pointless hurdle that the level could have done without.
One or two Berserkers in Gears 2 might have been fun, but frankly, I could have cared less either way.
I can also kinda see the grub health argument, though some did in fact wear more armor, which logically would make them harder to kill (unless, of course, you've got your shotgun in his face and pull the trigger; THAT oughta do it for pretty much everything 'cept the big ones, who really should need no more than half a clip).