Agree with billHall, I was just at the SFO Airport Marriott. First one that I've seen open on the weekends. That alone puts it head and shoulders above the rest. The food selection was decent when I was there; on Superbowl day they brought in several pizzas for free and saved me a call to roomservice
The worst? Almost all of the others I've seen are so cut and dry -- nothing terribly bad - just often terrible hours. So like doc I'll reserve judgement on this one.