Old school artifact decks eat Mirrodin decks alive.
New Damage rule eliminates the stack essentially.
I used to be able to attack/block with Mogg Fanatic and then sac him and deal damage to player/creature. But now, I can attack/block (it does block the damage) but if I trigger his ability, he doesn't deal combat damage.
I played t2 until Ravinca. I only do pre-releases and booster drafts now.