>>levoca+Yb3
I have plenty of complaints about them.
The highly addictive gambling mechanics in their games,
the extortionate cut afforded them by their dominant market position
or the very rough UX in many parts of the Steam client (takes forever to startup, shows pop up ads on startup, is quite the resource hog, the store that is a pretty poorly optimized website and a lot of cruft in the less well trodden areas).
But they do make some very nice open source contributions.