Elo in Badminton?

Hey,

I've been asking myself why ranking systems like Elo aren't used in Badminton (or other single/small team sports, for that matter). Looking at chess, it seems like the sensible thing to use to estimate how good a player is. I don't know how this is done in other countries, but here in Germany you form a team with other players from the club, and your team will be put in some league. After each season your team goes to a higher league if you lead the table, or goes to a lower league if you got stomped, and that's the whole granularity you get. Why is it a bad idea to assign each player to an individual rating to see how good they are?

PS not sure if the tag is right, but it seems like the most relevant one out of the whole list.