I've been sucked into the Pathfinder universe, as well. In large part, it depends on the median level of optimization in the group. I've found that despite many of its defects, and its continued hate on martial characters, it's still not too hard to build a competent Pathfinder character compared to most of them out there.
I think the Pathfinder Monk is playable, mostly by messing around with the archetypes. The Maneuver Master and the Master of Many Styles, with sufficient op-fu, can be pretty solid, I think. Not God Wizard solid, but pretty solid. You may also want to look at their Brawler hybrid class, too.