Based on what? Zowie FK has the A3090 sensor which is the same as deathadder and many of the top mice. Most users also have less problems with zowie (from what I've read)NixXSkate wrote:
Zowie mice are lame for osu!
Razer Deathadder 2013, Razer Abyssus, CM Storm Spawn, CM Strom Recon, Microsoft Intellimouse 3.0, Microsoft 1.1a Optical, and Logitech G400S are all great choices with for osu! (I've used all of these, as well as the Zowie FK)
If it didn't work for you, it's probably because the shape and weight don't go well together with your playstyle, that doesn't mean it's a bad mouse for osu! in general.