to Progressor: It all depends on the definition of the "close victory". Currently the system only takes into account the victory type of the player who won the game. You are suggesting to extend the system to also take into account how close was his opponent to reaching the victory of any type.
So, if I understand correctly, you want the system to check every victory type (tower destruction, building and resource). Then evaluate (assign major, minor or tactical to all three of them) and take the worst possible (for example if the results were major, major and tactical, the tactical is chosen).
to dindon: I agree that it's a good idea to deal with cheating some other way, than implement it in the rating system. I think if someone will use the dual account exploit, it will be relatively easy to track him down. After the game history module implementation is finished, it will be even easier.
to Xpoh: Instead of game logger we have designed a game history module to record everything that a logger would do, but has more functionality (you be able to view finished games). So, logger alone will not be implemented, however it will be part of the game history module.