Good RPGs for PC (MMO like)?

I just feel like I want to play an moorpg and stuff (mainly because I've been watching SAO and Log Horizon recently) but really don't have the time or friends to play with, so if anyone can suggest a good mmo thats easy to play solo or with randoms, or a single player rpg that has a good and diverse leveling and class/skill system
Well actually just something like Skyrim, but not Skyrim because I've played over 300 hours of that and its been months since I last played and all those mods and other things I want to install but am to lazy to just make me sad…

Something with swords and magic if possible (I'm already playing Warframe and enjoying the *** out of it so I'm good with futuristic stuff for now), or just a good skyrim or minecraft mod.

You might enjoy 'Kingdoms of Amalur: Reckoning'. It's basically the same as Skyrim. It's single-player though.

For MMO you might try 'Elder Scrolls Online'. It has gotten mixed reviews, but some people really like it. The bad news for that is that it's subscription based and you have to pay a monthly fee to play.

Mass effect 3 (Future)
Elder scrolls V: Skyrim (Medievil)
Deus ex human revolution (Future)
Fallout 3 (Post apocalyptic)
Dead Island (Zombies)

You could look into Diablo 3 - and a game that I've been really into is Wildstar, it's time consuming and probably not what you're looking for, but if you're ever curious, I'd look into it. The launch date is in a couple of weeks.