One of the best MMOs in my opinion. It's highly versitile and addictive.
I was amazed at the character creation. By the far the most unique and most advanced I've ever seen in an MMO. Frankly, the amount of options for customization not only boggles the mind, but makes every other MMO's character creation seem more like a chore then a pleasure. I spent hours tweaking my main character and many more hours after that create new ones just the fun of it. In other MMOs you have a small choice of facial structures, body shapes, hair colors, and clothing options; however, in CoH all these physical aspects can be altered to allow the most ascetically pleasing character possible.
As for Game play goes, it's good. There cases of better game play however this is still has a great feel to it. You have more freedom in this game than any other MMO. You can fly through the skies or leap building to building or ever race along the streets at super speed.
After playing awhile and getting some new powers, that aren't part of your original class, makes your character almost truly unique in the sense that you won't see many people around using the exact same powers that you have. In other MMOs there are thousands of players with the exact same abilities as you. You choose a class and you are stuck with whatever that class will give you, generally. In CoH you choose a class, but also powers and then you can have supplemental powers. Then there's also the enhancement system allowing you to make you powers unique as well.
The story of CoH is also immense fun. With many MMOs based on Movies or other Games and ones with original stories being rather bland and dry, it's refreshing to find and MMO with a story that is actually fun to be a part of.
The only thing this game was missing was PVP. PVP is what keeps me playing a game after I reach high levels. CoH doesn't have any. This is soon too remedied by the release of City of Villains, which will add PVP and many newer unique options that I am overly excited about.