I've been getting more interested in 5v5 since it seems to have more tactics & points involved. We run various groups, but they always include an MS Warrior / Holy Paladin. This team is also hovering in the 1700-1750 bracket and I forsee 1800's soon. We cycle DPS depending on who is online. This is good because it ensures games, but it means different strats depending on who is playing, and I don't like that. We cycle in a Hunter, Druid, Mage, Warlock depending on who is online. The Warlocks have different specs, which I'm not fond of, I would rather them both be affliction, but I'm not a Warlock, so what do I know.
I've given up on 2v2 almost since it's such a game of class match-up it almost doesn't matter your gear or skill. We run two Frost Mages, which is a pretty sick combo, but there's just too many combos that we can't take out. We're almost guaranteed a 60/40 win ratio, which is nice, but it's not point reliable. I'm still going to run 2v2 so I can PvP with my brother and some friends, but I'm not going to sit down and write strats and look up opponents like I do for 5v5.
Alright enough rambling, hopefully my next post will involve some content - I'm planning on writing a PvP enchant guide since I've been getting a lot of questions on the subject in-game.