Anything above basic content in 14 (which is lowest common denominator content) can honestly be quite challenging, and savage and ultimate content is very very difficult content overall. It's all about how much time and effort you're willing to invest, the first 70 levels of content is pretty braindead so anyone can beat it.
Curious if elder scrolls online is similar because I honestly don't know, haven't played it in a decade.
Vermintide is a lot of fun. The total war Warhammer games are pretty good.
My personal favorite (as an RPG fan) is Rogue Trader (40k) by Owlcat Games. Game is superbly written and the combat and world is pretty fun too. If you hate CRPGs, stay away though. This game really showed me the secret sauce Warhammer 40k has going for it.
I'm excited as hell for space marine 2. We'll see how that goes.