It might belong in some games.
And CS belongs in GW2 and awesome F2P games like Tribes and Mechwarrior!
Still does not fit sandbox or sandpark mmorpg's for me.
Heck I would not play majority of themeparks with CS. Actually I left a few cause of CS, even some to which I was emotionally and financially invested like Lotro few months after they switched to freemium and I've played it for over 1,5 years, had 2 high-geared characters and like 6000 + Turbine Points still. (from various rewards as I was eglible- I've not spend any money to buy any point packs).
Same as susbcription would not fit i.e Skyrim or Fifa.
Besides Mechwarrior Online is not released yet and imho it seem it might get trash business model like WoT.
Tribes I don't like. For me it is weak game.
LoL and other MOBA games I tried (Dota 2 and Smite) are boring like hell as well. I still cannot comprehend why they are so popular...