Ive heard the complete opposite is true. That rails while improved is still a pain to deal with. THe benefit of tails is that theres more and more people using it so theres some expertise out there.
high volume/high availability setups can be complicated, but that's the same all over...
Im not the biggest fan of rails, i kind of like padrino actually, however i do like ruby and have found some very cool people within the communitee.
The problem is something gets started in the infancy of a framework or tooling and continues to get propagated. The "hearing" rather than "using".