I've been using Windows Phone for a while now and I really, really like it. It has some rough edges yes but it's a good looking snappy OS that's only getting better each update.
I'm not an enthusiast phone user or anything like that too, my phone literally sends calls and receives texts with the odd app (WPCentral, Readit mostly) and some web browsing.
However I can see someone like Linus preferring a more fleshed out OS for a daily driver phone. Surprisingly the more feature rich operating systems are preferred. Who knew?