Yeah, Anti-Monitor is powerful! He can be a scary piece going up against him in heroclix. Even when I see him in an issue of Green Lantern or Green Lantern Corps, his presence is like: wow.

Ya, he's very kool, I just wish they had made him Galactus big, and not sentinal sized.

At mid-dial his AV drops to 9's and 10's. Yeah he's got Multi-Attack, but he's really not that dangerous. The Regen is not that great, unlike Starro, Roll 2d6 and subtract 4-6. If you average a 7 you are healing up 1-3pts. It's nice but not that great.
You are right about blocking terrain. Once you hit Phasing/Teleport, the Anti-Monitor runs away until he doesn't have Regen anymore. That can be annoying!!

He gets a 9 attack 6 clicks into the Anti-Monitor's Destroyer dial and his first click of 9 attack is when his Healing SP begins so the Anti-Monitor will almost never be on those 9 attack clicks for more than a turn (which there are only four 9 attack clicks anyway). I'd play him with a YELLOW LANTERN, use ICWO on him, and put Batman Alpha Oracle on the card so AM can use her Perplex. Use the BFC Infiltration so Anti-Monitor can start the game half his speed away from his starting area remember he's STARTING in that square so any objects under him ARE NOT DESTROYED. A Black Lantern would be a good idea too as it will allow Anti-Monitor to heal when he K.O's somebody and heal when he doesn't. Over all the Anti-Monitor is a strong figure that's best played on his Annihilator dial with 14 attack Psychic Blast, 19D Imperv, and 6 damage with Outwit. My only complaint is that the Anti-Monitor's Healing SP stops him from being healed whenever a figure is K.O.ed for any reason. It's pretty lame that an opponent can run a bunch of poggs push one every turn and shut down The Anti-Monitor's healing.

Winning!

...except against Nemesis...