The type that automatically puts me at the top, then handicaps all of my opponents so that I can never lose.
I want the one which always puts complete noobs against super pro players, only to be able to read countless of rage threads on the forums of how they got matched against much better players by an unfair system and how everyone else is a hacker and how Uber is completely retarded. Oh, wait...
With some research (correct me if im wrong) trueskill is a modification of elo. It changes your rating based on your performance rather then just your win loss. Seems intelligent.
My experience with FA Forever makes me believe that Trueskill is by far the best choice. Having separate 1v1 and global ratings as in FAF wouldn't go amiss in the fullness of time.
TrueSkill is patented and trademarked by MS. Therefore I propose the remarkably similar, but just different enough, UberSkill! Regardless, if you do use a normal distribution to track skill (and you should) could we please have visibility of mu and sigma values not just rank/score output?