Um, would it make you cry if I told you the store where I coordinate D&D Encounters at ran 8 full tables last week?
Sorry,
We had twelve players and two DMs. When they were trying to decicde how to split the groups betwee the two tables, I suggested everyone be divied up so that each table had all four roles covered.
One of the DMs repsonded (sarcastically, I think...) "make sure you optimize those characters too."
My immediate response was "I'm not optimized. That's why I want a defender and leader in my group. So I don't die."
The rest of the encounter, I couldn't stop running my mind through through various fantasy stories, heist movies, super hero teams, power rangers episodes, sports teams, and I can't think of a single shred of precedent to suggest that a team of complementary specialists is somehow meta or has no place in a serious roleplaying game. The most homogenous team I can think of is the Seven Samurai, but even they had specialties: a rogue, a tactician, some brutish guys, some light fighters...
I just can't abide this idea that wanting to cover all roles in a party of six is a bad thing.
In the end, my table had 2 leaders, 3 strikers, 1 controller and almost TPKed when the dragon got bloodied. Fortunately, our halfling bard was able to force a reroll on that attack, resulting in a miss which only managed to bloody the entire party.
We started last night, GenCon really did a number on getting all the packages to the DMs.
We had 12 people signed up to play at 2 tables. We ended up with 21 people at the game. We ran a table of 9 and a table of 12 simply because it would have sucked to send all those people away without playing.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.