I've never used RoR but I know people that still swear by it. It's outdated by today's "standards," but ActiveRecord was and is still a gem (heh) and a lot of RoR's foundational principles have been adopted by the existing major frameworks.
Regardless of technical acumen, I believe RoR doesn't deserve to be compared to Mongo for one reason: the RoR developers never tried to gaslight their users into thinking they're the reason everything broke; they never said only "if you know what you're doing" can you avoid these hidden pitfalls.
I'm glad my gut instinct was correct and that it really wasn't worth the hype. It reminds me of Ruby on Rails.