DA MM was mid trans at best and his powers were limited in a local area, his purposely de-powered hell he was in the raft and it was stated then in the New Avnegers arc. Normal level MM would rape Sentry all day and everyday of the week twice on Sundays, it's been stated on panel MM has de-powered himself. Sentry defeat a mid tran level beings which is good but look in context he never fought MM at his normal levels or his highest which is Evil MM who would have blinked Sentry out of existence.