The main criticism I have of metagaming is that it's really just bad play. If you have a sample size of ~20 games played with the same person, enough to observe their style of play through a period where it may change due to new experience, mood, context of the game, etc, you may be able to tease the "essence" of their play and be able to make judgements based on that. However, most people on GAFIA have played with any other given GAFIA member at most 3 or 4 times. That's not enough for meta to be useful, and it's therefore normally just going to be bad town or fillering scum using it.
Despite this, everyone is going to try and lynch me D1 in season 6. :/