Came here to ask the same question. Been a while since I used the gem, but I remember it being very useful, and fairly extensible. Sounds like @akanet did not have the same experience. Would love to hear from others if they have run into the same issues, and if so any alternative gem/libs they recommend.

Yeah I thought that was weird. I love using Devise, and it has a lot of great plugins. It's very easy to set up things like OAuth and two-factor authentication. And it's not too hard to customize with your own warden strategies.

It is very hard to extend in even small ways. I still use it, I just hate it.