It's been over 7 years since I finally jumped off that train (pun intended), so it's going to be difficult to boil down nit pics about it but a few things stand out.

Yes it is very opinionated and it seems to want to constrain the programmer to its data entry style of development rather than let the programmer build with code.

I don't think it's just because it's a framework because I've been in other frameworks (outside of Ruby), and it still felt like I was actually coding compared to ror.

The culture felt like I am finding a gem for everything instead of actually implementing it myself.

Like I said earlier, it felt like data entry. But could just be me.