Well, it's a Medium BAB Chassie, and it's not hard for a good dm to adjust for that with enemy's that either prioritize mobility so that the monk can't pin them down in large numbers every turn, thus giving the rest of the party time to do some killing, with enemy's that can take a significant beating and thus will take a round or two to drop each, Trolls coming to mind just for a MMI example off the top of my head, or enemy's that are good at not taking straight hits for full damage. Just a human with a tower shield get's a 50% miss chance right there. Or a human with a spiked chain and an enlarge person spell tripping targets.

And all that's being done with little to know spell casting, and no spell casting above 1st lvl spells. That's entirely reasonable for a mid level party to be fighting.