Whilst Mortal Online has far too many bugs, glitches, low-quality textures, and an annoying freemium (which I view as pay-to-win) business model, it definitely has a lot of ideologies that make it worth looking into. It's a first person MMORPG with no PvP restrictions that allows for you to kill anyone you want at any given time. There are completely ZERO quests after the tutorial. You have the ability to take over any town as a guild and you can even build houses / towers / fortresses in the open persistent world (other players can attempt to destroy your created buildings). You can steal from other players / NPCs whenever you want, but if you're caught you suffer consequences, you lose the loot you carry upon death, you can tame animals from rabbits, to wolves, to donkeys and horses. It also has a unique skill system, there are ZERO classes to choose from and you can place skill points into what ever skills you'd like (up to 1100 skill points, 100 levels per skill if you wish to max them).
Rather interesting MMORPG, with some similar aspects (first person mode, can choose your skills) and some very different aspects (open-world-unrestricted-pvp).
I advise Zenimax takes a little look at this mmorpg, to open their eyes to even more mechanics and ideologies that could be very interesting to incoprorate into ESO.