I assume you are talking about timed self races that are submitted against other people's times as competitions so to speak. If that is the case one of the problems I assume that might have hurt the time attack challenges of the good ol' days was the ability to... well frankly... let's just say cheat with the likes of certain things like codebrxxxxx disks (GT4) xxxxxxx Editor (GT5) and the like. One thing though... that will most likely be a thing of the past with GTP being "almost" entirely online which certainly will circumvent that possibility in all likelihood. At the same time I don't think it won't matter anyway, cause with online racing, I assume there wouldn't be much interest in time attack anymore.