I have been giving it a try as well. Im a little dissapointed in the only 6 powers thing, since none of them really strike my itch (save maybe gadgets). I havn't tried sorcery or nature yet. I like the vast amount of weapon choices..so far I like hand blasts the best. Finding it hard to design a character though, plenty of options, I just suck at it I think. I just dont wanna do the typical "Oh haey lets pick black and red and now were KEWL". I want something kinda uniqueish, but lol ><. Anywho, havn't done a ton with it yet, but its not bad.
Well you can theoretically get the "light" power via dlc or a legendary account.. and the developers already announced that they will implement lightning and earth powers into the game.
As for the appearance of your character... well you can collect all the different styles for the equipment and change your looks sorta "on the go" .... as well as the color palette .... as a matter of fact you will get additional "unique" styles as you progress.
What strikes me as somewhat odd.. is the fact that the free to play system does not really limit the player all that much... you get to see almost all the content of the game... I am not really sure that SOE will get that much money out of this.