The Elder Scrolls Online: Tamriel Unlimited(PS4). I am not much into MMO's and such but this is quite fun. A lot of the quests are similar to the quests in your average single-player Elder Scrolls RPG, you even get to make choices every once in awhile. It's also fun to see people suddenly join you on your battle out of nowhere, it makes the most basic quests feel unique and memorable since you can also hear the players. I still haven't teamed up with a buddy but I can imagine that it would only add to the fun. The graphics look pretty dated but all of the characters are voiced(which is pretty well done for a game this massive) and the world feels alive. There are also raids and large scale pvp battles but I still haven't tried any of those.
In short, the only complaint I've had with this game so far has been the graphics, the rest is superbly done. Compared to a game like Destiny, it has a lot more to offer whether you're playing solo or with a friend.