I just started playing again a couple days ago. I win most of my games, usually at the top of my team. When I lose, I'm on the top of my team, or two two. If I quit a game, it's because my entire team is afk, or they are so bad that I can't handle playing with them because they try to snipe people with Assault Rifles.
Despite getting a 1550 - 1750 average range everyday, and winning more than 75% of my games (despite the fact I haven't found a good team I can communicate with and has the same skill level as me). I only got a bronze ranking. A year ago when I played, I did the same as I was now and I got a GOLD just by messing around. So, even if the division is based off a w/l, then I should have a lot higher than Bronze. So why is the Division system so bad? Halo 3's ranking system was so much more direct and accurate.
In any case, I'm also looking for a good team to play with.