Only in AT you can enjoy team strategy and depth, which you cannot experience in random team.
It really depends on who you are playing with / against. I've had plenty of random partners where you can use team work and strategy, just requires communication at the start of the game. Communication is a big part of the problem - whenever I play with randoms (2v2, 3v3 or 4v4) so many people are confused just by writing "Hey" and quite a lot are just dicks about it. Your never going to get any kind of team work going with them because they have no desire to play as a team.
Decent randoms can beat teams, even good ones but more often not someone gets screwed by the matchmaker. Its not uncommon for me to be matched either with or against people with only a handful of hours in the game. This isn't the end of the world as long as the rest of the players are (relatively) balanced around this. I would much rather wait longer for a more balanced match than just stomping people / being stomped. I'm not against playing against teams, but prefer playing against randoms. Shame the player base isn't big enough for more balanced games.
It generally seems people would rather wait for games, shame relic wouldn't add some kind of option for this.