I sincerely doubt the UAC20 Hollander would ever be effective even if the gun were hidden in a tiny box in the center torso. The thing has just so little armour, the few shots it would spit out would hurt, sure, but it would rarely be able to do much more than that. Funny thing is that I'd happily take the UAC20 Hollander's loadout over the Shadowcat A. At least it carries extra ammo.
The Hunchback IIc would have more success only because it can belt out twice as much damage in the same amount of time. Consider that - the Mauler has *two* UAC20s *AND* an MRM40 (well, two 20s). The Mauler is lethal but it's not because of a single UAC20, it's the fact that it has two of them along with a super-powerful missile swarm.
I love the UAC20 + ERLBL Oro
lol, I literally can not remember the last time I saw an Oro. I will say that the Demolisher is also awesome, but for the same reason as the Mauler - a slow, immensely stable platform that can take a lot of damage. Plus, again, it has two of them.
I don't know how you can say it's easier to aim with though. I used to just snap my aim to a spot in front of the mech I want to hit, fire, get those two nice meaty-sounding smacks, and disengage to let it reload. Now I have to lock myself into a position to hit the same area multiple times, lead my aim not once, but three times, it all just makes it a much harder to use weapon without as much payoff. If any of you are saying that the old UAC20 was weaker than the current one, you're on crack.