I highly recommend Warframe if you like action games. You're basically in endgame within a week of playing the game and there is no reason to farm rank or anything in the game. You can just sit back and play missions you enjoy. There are defense missions, survival, capture a target, a 4 way capture the hill called interception, and a bunch of other things. You have armor that has special abilities and you have guns and melee weapons to use in the game. To top all that off, voice chat is integrated in the game so many people have mics and you can just talk to people in any particular game which is so much more immersive than typing stuff out. It won't make you feel alone like in RS and wow. Once someone hears you're a new player you'll have a game full of best friends trying to help you out. A very great community is waiting for ya
Have you looked into Albion? It is just coming out and I just mentioned it in another thread on here. It may be worth considering especially if you like runescape
D3 is great but it doesn't feel immersive enough for my preferences.