Been messing around with rocks and PT 11 yesterday. The damn things fly so slow I have to get close to hit reliably. Might aswell take a different weapon instead. I made a kill with rocks, where I threw at the archer. He sidestepped to dodge, stepped back to dodge my next throw and took my first rock in the face.
I got the most kills with javelins and throwing axes. I'll mess around with the 4 point shurikens tonight.
Oh yeah, my build will be 10 PS, 12 PT and 1 WM at level 30. I find it effective in sieges, but lacking in battles. The REALLY slow speed and ineffectiveness in melee (even with 10 PT, not having wpf hurts) makes it hard to get out of trouble. In sieges it's great to snipe archers with darts when attacking and hurl javelins/axes down ladders as a defender.
This is a much stronger and more well rounded build than dravic's and my joke build. I would recommend instead of using the extra WPF in throwing, use the extra WPF from your WM in 2 handed or whatever melee weapon you are going to use to give you a slight speed boost. 5 WPF isn't even remotely noticeable at that level.