Hmmm, I remember a lot of people saying they were running large groups of minions like 30+ at some points. It has been mentioned that numbers do more than power, and swarming a fighter with 7 weaker enemies pretty much ensures a situation that doesn't result in the continued existence of the fighter. In my custom game I've kept the battles a bit smaller as many of them are fairly new to rpgs (having only played in a campaign of mine (Pathfinder), and that which one of my players started (4e) in order to try out DMing), rarely going over 10 of anything, and they still manage to just eke by a bit. The exception being possibly the last battle as they all rolled 8 for initiative, and I explained that this is a very unfortunate situation and they thought nothing of it until after a bloody battle with goblins in and around a river that almost cost the party a cleric and fighter (the DM's d20 was a holy roller that day). Well, as soon as they got everyone revived I rolled on the chart of fate (totally not the bestiary) due to the unluckiness of 8's and an ogre charged them from the woods (it was also a pretty good way to give them a trail of broken branches they couldn't refuse. I think I hear a train, there must be rails nearby ^_^ ). Interestingly enough, the single ogre did not fare nearly as well as the goblins, so I guess there is some value to the "overwhelming numbers" philosophy.