Monks traditionally have good AC, but depending on the point buy they either don't normally have great AC and a good offense.in the current rules the extra attack is o ly with a full attack while flurry. my lvl 9 monk with PA is something like 13 13 13 8 8 for attacks 1d8 +11 with temple sword. +23 or so to trip with the sword.
really its been a fun character I don't feel underpowered though dr irks me. my AC is 32 buffed how is this char weak?
Things such as point buy, treasure, and the campaign itself are a factor. In humanoid based games they do a lot better than ones with monsters because the CMD's are lower when fighting humanoids.