Not user friendly. I haven't been able to get all the answers I need without resorting to phone calls or outside help. And even when I have been able to find the proper info, it's taken a bit of searching. (Can someone please tell me why all leave to remain applications, included marriage-related ones, can be accessed from the "working in the uk" section?)
And I'm pretty internet savvy. Imagine someone who isn't very experienced with computers, or only has limited access (though a library or a school, for a few hours a week, for example), and needs to find an answer quickly.
(Above refers to the IND Home Office website.)