Well, I have played 12sky before with sheik but we left early because I believe it was around the time PW-MY was coming out. I didn't really like the first one that much (Maybe it was because i didnt know what i was doing perhaps lol).
The only reason i tried 12sky2 out is because mainly I had nothing better to do and i was bored of RunesOfMagic. So.. I tried it out and it was awesome =D I missed grinding so long that i've grown to enjoy it lol. I think what I loved most about the game is the fact you can AoE a shitload of your eneimes at once and still do a decent amount of damage. That was my fave ^__^
Of course.. I kinda left 12sky2.. not because I didn't like it...because i LOVED it. I left because I got invited to play CoH/CoV (City of Heroes/Villians for those who don't know lol) so yea. I'm enjoying my experiences there as much as I was enjoying 12sky2 ^^
So with all that being said, if you want to learn about the game a bit, it's going to require a bit of reading in-game. just press the H button and most of your questions will be answered lol. (for 12sky2)