Imp said:If they're so greatly simplifying monster stat blocks, the summoning should be much less of a problem. That's the whole thrust of 4E combat, right? – to play through slightly larger combats, faster. If a couple of tagalongs in the party "wreck" this, it doesn't say very much for achieving this goal in general.
I never had a problem in 3e. i just asked the player what do you want to do with your monsters, I rolled a stack of dice and it was usually resolved in under a minute.
But yes you are right if the attack a pile of monsters is there current design goal, one I really like(wasn't a fan of the one monster or small groups 3e emphasized) the summoner with a horde shouldn't be a problem in any game.