Minecraft, Shadow of Mordor or Elder Scrolls: Online?

First two are cheap, but eso looks like it'll last me a lot longer.

Minecraft doesn't have and end to it truly. It takes as long as you want it to. Watched a play through of Shadow and the last boss fight was sad but rest of the game looked good. Don't know anything about ESO honestly but be prepared for trolls since it is a MMO.

Shadow of Mordor. Clearly.