The absolute worst attack for me is ....anything from mount Cervantes!
No, really, Mike has a great center, and will give a committed attack with honest intention.
The down side of this is he is strong, centered, bigger, and has a real penchant for catching me with ryo-katatori (two hand lapel) grabs and "planting his center.
Gotta move before he plants....I know this, but it is one of the most difficult things to do when Mike is comin'-on-down to latch on...
Really makes you get your timing better. (or look foolish, either one)