I don't actually see people thinking about archetypes and themes too much but it sure is an interesting topic for a survey.
Players might find that they aren't adept in certain archetype and just focus on the game genre they've chosen. Real time action games are after all totally different from puzzle games or story driven turn based games. Taking on a new kind of archetype is a leap of faith and you start out from bottom. Quick reflexes and perfected mouse aim you developed for FPS games won't save you when your friend schools you in RTS even if you tweak the setting and make considerable handicaps. Suddenly you are in whole another kind of social position.
It is pretty easy to move within an archetype, going through many themes. But some themes might fend some people off altogether as well. "Ponies and sunshine? Bleh." while other might think "Blood and guns? Gross." Themes and entire franchises can help players widen their archetype selection beyond their current repertoire as they make spin-offs and expand genres. For example World of Warcraft took a lot of Warcfrat players in the world or MMORGP and I'm sure many WoW players have visited the RTS counterpart as well because the game series share the story and history which makes it very interesting.
How big a deal the archetype and how good you actually are playing the game ultimately depends on the character and why you play a game to begin with. Because after all people can have multiple motives to play games:
(generic examples)
I want to try and succeed => Platformer
I want an intellectual challenge => Chessmaster
I want to manage, plan and organize => Civilization
I want to hunt and be hunted => Counter-Strike
I want to "belong" and interact with other people => World of Warcraft
I want to pass the time casually => Angry Birds
I want to engage in a story => Final Fantasy
I want to pass the evening with my friends in our living room => Wii Sports Resort
I find myself rather competitive player at times, I have to need to be good at something, I need challenge and I need to "succeed against odds" so I sometimes play FPS games. But then again I also enjoy story games so much and for me they beat reading a book or watching a movie any day. WoW was great when I played it, I loved the community and interaction in so many ways and situations...The only game genre I've skipped are the casual games like Candy Crush, perhaps because I don't have small amounts of time I couldn't find something "useful" to do and what gaming I manage to squeeze in is always a serious investment.
I guess there are many aspects to every person and to each his own