You need a uplay account, but not the client. That being said I've uninstalled this game twice (closed beta and open beta). It's pretty, decent idea, handles well... and it amazingly biased towards a defender. The problem is that it's in 3rd person perspective, so when a defender is hiding behind a wall (or door or car) they can move their camera angle to see what's ahead of them. When you're attacking they pop up, bang and kill you.