Complete customization of characters. Complete. Its not like you get to pick out your race, and some clothes, you can tweak everything. Body shape and size. Color too(Theres a huuuge set of colors.) Then you customize their costume. The first ones free, and I think you can have up to 4 outfits. Youve got to complete missions and get your infamy up to pay for your other costumes, or sometimes if you complete a certain mission, you get it for free. Thats how you pay for stuff, infamy. I guess there kinda like quest points. Theres a stuffload of power sets as well. Theres another set of powers that everyone can choose from once they reach lvl 14 I think. Alot of them are traveling powers, super speed, flying, teleporting, leaping (like 200 feet per leap), or invisibility, healing, leadership stuff, and others I dont remember. Then you can team up with friends, or ride solo if youd like. When you get to level 10 I think, you can form an official alliance with a base and all that. The worlds are huge as well. Many different cities, with plenty of different enemies.
Thats how City of Heroes and City of Villains were like anyway.
Bleh Played it and its stupid They nerfed it so much :P
Pretty much all MMORPGs go through it. What else is so stupid about it