Haha, I'm not entirely surprised. The UI is pretty dated, and overall it can be kind of janky sometimes.

I'm curious though, what aspects of it do you usually hear people complaining about?

When the first rolled it out and signed everyone up at my office people complained all the time about the spam in their mailboxes. Then we figured out how to delete our accounts. Now the only people who use it are those that are trying to impress someone by giving the image of participation.