In ME3 I've just been using AP ammo as my bonus power. I probably shouldn't, since I already have Cryo and the almost unused Incendiary, but I can't think of anything I'd prefer. Cryo is fantastic against most enemies, as is my fully upgraded Cerberus Harrier and my armor pieces dedicated to increasing damage, so it's very hard to switch weapons, armor, and skills when I can cut down any enemy so quickly. Just finished both the Omega and Leviathan DLCs. Once more they present me with cool assault rifles that still can't quite match the Harrier and cool weapon components I'll probably never use. I don't accept any components that increase weapon weight so I can keep up a steady rate of Cryo Concussive Shots to freeze and shatter whole groups in seconds. I used to dream of getting bayonets in a Mass Effect game--but now that I have both them and the Omni-blade, I find I just shoot all my enemies anyway. I almost never use grenades since Concussive Shot can arc around cover. On a side note, Spoiler : the Leviathan's explanation for the Reapers, while not as dumb as I'd heard, was unsatisfying, and I wish I actually could've become friends with Petrovsky. He seemed like a bad fit for Cerberus's values.