He is possibly the most level headed of the Losties and definitely the best at judging characters. He insisted that Fenry was one of The Others and was the first to suspect that Michael was compromised after returning from the jungle.
Kevin: Yeah, heck George Bush should just let him make all the major decisions. Vote Sayid!
Ash: Sayid would take on all of the Others armed with only a toothpick and there'd be bits of Others dangling about. Like fingers and shit.