Actually, it says "3 attacks, 1[W]+Dex per attack". Meaning that, if you target one target three times, you should get this:
Hit once: 1[W]+ Mods, dazed (save ends).
Hit twice: 1[W] + Mods + 1[W] + Mods, stunned (save ends).
Hit thrice: 1[W] + Mods + 1[W] + Mods + 1[W] + Mods + 2[W], stunned...