Marvel Heroes, free to play, created by David Brevik (a diablo guy, not sure what role he had), but it's kinda low quality at the moment though they have been updating it like crazy. Nerfs and buffs all around, which is stuff I like. Thf getting assassin was xmas to me for example.
http://youtu.be/kyu_3yknYnwI usually play it as a single player game, though sometimes people will enter your instances so I just leave and try again. For the open areas people will always be around. It feels like that xmen arcade game when they are fighting things with you.
The real money stuff are:
Extra storage tabs - You'll most likely need this if you level a lot of heroes like I do with anything I play.
Characters - You can unlock these naturally by collecting splinters which drop all the time, I'm addicted to rolling the dice which usually don't get me the character I want and I like the random excitement.
Costumes (skins) - Never bought one, I have 2 Dead Pool costumes from doing legendary quests things. Now I need to unlock Dead Pool or craft a random costume when I get a third.
Boosts (exp, rarity, special item find) - these are given out like candy in the main quests and from cards which you can get from doing terminal challenges. Said cards can also give you good stuff like the costumes or rare gear. Exp is 0 problem without the boosts. I have 2 capped characters and I'm going to prestige one a few times, but after leveling some others up.
Respec, minions, etc. - Respecs are everywhere so that's a waste to buy like the boosts. lolminions (also obtained via cards).
I'm almost able to buy my first Legendary item (relic weapon type of item). When I get it I have to unlock stages of it. Each stage adds a good amount of stats. Stage 5 being the max.
Examples
I don't know which one I want, and for which character. Getting 300 Odin marks takes a while, and you can spend Odin marks to bless your artifact armor so my final character could be very pimped out but it's not needed yet. Raids are going to be added later, though Xdefense (horde waves with treasure gobblin waves every 10th wave).
This game has me reading up on the characters, and watching the movies/reading comics lol. Just yesterday I watched the new Xmen, Captain America, and Thor trailers for the first time. Winter Soldier looks like it's going to be good.
Comichead youtube vids are very entertaining. Watched House of M when I got Scarlet Witch. Sick stuff
http://youtu.be/GovhpQB97Ys"This bitch is fucked... UP!" x 20