Mathias, for the most part, is actually right though. Most people would reflect themselves equally in the fantasy world as their real world counter parts. Would I be a sorceror? Maybe not, maybe I would. Who's to say how and to whom I would have been born to? How I would have been raised, where it would have occured and what life choices I would have been given. It boils down to basically what kind of person you are "inside" not what your enviroment has created for you. Most people wouldn't become sorcerors/thieves/murderers in the fantasy world for reasons tied more to who they are at a base level than based on how their enviroment shaped them in the real world. Most would be happy to live out fruitful lives with loved ones and friends, enjoying the fruits of simple labor.
I can only speak for myself in the sense that deep down, if the options were available to me, I'd be making every single effort to grasp at any kind of power that would give me a real advantage over others. In an enviroment where there is no "current technology" crime labs, it'd be much like the early 1900s were here. With the right motivation and access to tools, serial killers and thieves livedand thrived for decades without being caught (See Carl Panzram or Albert Fish for reference) if they were caught at all. Add to that magical weapons/clothing spread throughout the realm and you have the potential for real carnage.
Which basically brings me to my point. Would I be some all powerful supreme leader of Evil? In a "realistic" sense? Probably not, unless birth/race/luck rolled dice in my favor. Otherwise I'd probably be a gleefull mass murderer, happily living out my days slitting throats, raping and torturing till I either retired wealthy from the right kill (rich landowner, taking all their possesions) or dying horribly to attacking the wrong target. Either way my life would be the free daydream become reality I imagine it would be. The end result mostly hinging on how much training I would be able to absorb at a young age from various non-savory types and if I were able to come into possesion of any kind of magical artifact.
@Dave - There are no holodecks in Star Wars. You're thinking Trek.