When I used it the launcher would constantly forget my login. And then for older games like Splinter Cell it asked for a login everytime I launched the game. It was ridiculous.
It's not just a launcher but another garbage DRM method. But yeah, if they'd remove UPlay they may even get me back for the odd title. UPlay was the major reason why I started boycotting them.
Ubisoft's bean counters had some trouble reading the market on this one.
They left Steam because they felt the 30% cut that Valve takes for sales on their platform is way too high, but didn't account that users of Steam are really entrenched into that platform and don't want to leave just for the chance to play an Ubisoft title. So instead of seeing 70% of Steam sales of their games, they saw 0.