I used to hate teams...I used to hate hackers, too...(technically still do, but I meant in a sense that they always killed me and I was getting annoyed.)
...I have made many large posts/"essays" that have never made it to the forums because I caught myself and said to myself "this is stupid...I can think of a few arguments to counter my own, this will get nowhere." I admit, that a long while back, in my first week on these servers, I was very close to making a huge post about why teams were imbalanced and I highly disliked them. (never would have asked for them to be banned, though.) I don't blame you for thinking allowing teams makes it feel wrong and imbalanced...but I've learned several things over time by playing on these servers.
You can get better and take them down - even huge teams up to 6 are possible. (unless their pros, then you're probably going to die.) Heck, I've been against a team of 4 pros before, took down two of them, almost three before they finally got me down - I had less gear than all of them and was the only one left alive aside from them. Sure, I didn't win, but I got a lot closer than I would have when I first started playing, and they didn't feel as overpowered as they used to - not nearly.
But mainly, I told myself that stopping teaming, even only large teams, would ruin it for many people. I have a few friends myself that enjoy playing with me, and up until recently when we all became busy with random things, we played everyday, as a team...not because we needed to play together to win (well...one of them did. :3) but because it was just fun to play with friends - many teams you see may not actually be teaming for a better chance to win at all - maybe they are just having fun, and who's to stop that fun? (Well, possibly the person who kills them...but that's a part of the game.

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Your best bet is to overcome teams instead of attempting stopping them from happening. Even the large teams are possible with practice if you play it smart, I know I'm nowhere near the only person who has taken down a team of 6, (7 if you count the guy the last member of their team asked to team with in deathmatch.) and that was back before Breeze was even added...back when I sucked. xD