I have played near every roleplaying design worthy of mentioning.
Been playing since my early teens which was back in the dawn of the hobby.
I like scifi, but find most people really don't actually know any real science (Star Wars and Star Trek are space operas, not real science eh).
I tend to play in cliche fantasy settings, as it is not so important to retain scientific accuracy (as there is no such thing as magic after all).
I run the games as well as play in them. I prefer running them, as I get to act out all the NPCs which is always fun.
Being an adult, some wonder why I still play kid games, and my response to that is, what sort of idiot calls good fun entertainment a kid only past time in the first place?
Get back in the office you dull boring types I say
I currently play with a mixed group. A couple that is in their 30s, my wife and my 11 year old son. Makes for a nice sunday evening.
I do though, think the sort of style, where you get a few guys together in any age grouping, in the absence of any females, tends to get too predictably macho posturing slanted too easily.
Thanks to the d20 system being fully opened to the market, the hobby has been flooded with a swarm of manuals. Some are ok, some pure crud.
I prefer the Alternity design over all others.
Rolegaming isn't wargaming though.
I don't think they compete with each other.
They are not even similar.
But rolegaming can usually interest ANY person with a smidgen of imagination.
I have nothing remotely kind or polite to say to any of the screwed in the thinking department relgious community where rolegaming aka Dungeons and Dragons is concerned.
I will not say any further here.