Apparently there was a glitch with the Xbox Live system and the cause of the problem has yet to be determined.  If they are able to restore their database from a backup (really, you’d think they’d have backups) then all will be resolved and gamers will have only lost a few days of stats while they were down.  If the stats are completely lost, they are likely to lose a few gamers.  I know that after Bungie wiped out my Halo 2 (and Halo 3) stats a few times I just gave up on the game.  I understand the reasoning they claimed, but there has to be a better way than just globally wiping everything.