The ELO system does not work with team play when the teams change from match to match.
Take the StarCraft II model for example. The biggest issue here is that when you work with a pre-made group, your Rating will typically spike. Then when your team isn't around you get crushed because you're playing people that "your group" is good enough for, but not you personally.
What ends up happening is that players that "usually" have a group stop solo-queuing all-together.
Think of it this way:
- What is your win / loss ratio in a group?
- What is your win / loss ratio as a PuG?
Now, eventually (if you group considerably more than solo) the Elo system will force your win / loss ratio to 50/50 even when you're in a group. So... what happens when you decide to solo? You'll be losing every single match.
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Because they are using the exact same model that SCII uses, which is a 1v1 model based on your ending rank in team games.
Edited by Pugastrius, 19 December 2012 - 09:34 AM.