I've played it during Beta and thoroughly enjoyed it, being a comic fan it really appealed to me. Where as its not perfect, its certainly a good starting platform to build from, and has massive scope of potential as far as storyline and expansions.
I enjoy the combat, feels more action based than any other MMO i've played.
However Class selection and roles seemed very blurred to me, if CK could be so kind to do a quick write up explaining class selection and choices that'd be helpful for me also
Character creation/design aspect - great, you can make some fantastic looking characters when it comes to costume design, however facial and hair features was a little limited. I personally went for a realistic looking superhero from the DC universe.
If your a DC comics fan there's lots to love, from fighting OMACs to all your usual villains. As well as some lovely animation sequences with art work by Jim Lee who has done the in-game art.
If I was to put it to anything its like City Of Heroes but better, as the scope and the story actually fits, where as in City of Heroes I found myself running through the same instance just with slightly different layout at most points, with DC this never happened, not once did I come across the same level design so this coupled with the familiar characters made it feel much more comfortable.
It's got a long way to go to reach its peak, but its a good start, and personally feel its worth jumping in from the beginning to offer my support towards the game.