24/15 is a monstrous shield build too, if you're gonna be in the front lines. Not AS much room for solo heroics as the agi shielder builds, but with a MW Italian you'll wreck with 8 PS.
Comes out to 6 IF / 8 PS / 4 shield / 5 athletics still i do believe.
24/15 might be a better build for large battle servers, simply because you don't have room to maximize your speed bonus in tight-quarters group combat (you'll get in the way of teammates, and expose yourself to enemy attacks).
Unless you use a cleaver / ACS, cut swings from a stationary position on one-handers don't hit that hard with 6 PS.
18/21 shines when you have relatively few enemies (you can get behind them and stun/kill them while they're engaged with teammates), or in loosely-knit fights (where you can dash from fight to fight, helping teammates double-team enemies as needed).
dude i have now 124 points and i am lvl 22,and i have balanced scimitar. I suck so hard. other ppl with non loomed items outspam me. Not to mention agi whores,and big wpf 2h,polearms,and other scum. Everyone have lots,and lots of wpf. You need to get more or evryone will be second faster then ur weapon.
You can maybie compensate it with more then 6 athl but below that you are going to be spammed all time.
You can stop yourself from getting double-swung with 1 WPF, let alone the 111 you get for free at level 30. That's mostly a footwork issue.