My general opinion Gowi...  ignore any criticisms.  You can make your plot any way you so wish.  If anyone has a problem with your ideas they can start their own thread.

Further, if you ask me, your Virtual Gaming system feel a lot like the Oblivion video game.  There are no classes there either.  You want to get stronger you lift things.  You want to be a better swimmer you jump in a river or lake and move about.  You want to be good with a sword you pick one up and whack some goblins.