I have tried 5150 but it has always seemed too tied to its own limitations – you can’t build or customize your own game, you have to use the built-in lists and unit types and factions, so it always needs a ton of modding to make it into a game in my own universe.
I don’t really understand what you mean by “have to use the built-in lists and unit types and factions” Why? You just build the characters and put them in your game. That’s obvious so I am, obviously ;-), not understanding what you mean. For me there are too many die rolls
Referring to the other 5150 games I guess – the RPGs aren’t too familiar to me. The tabletop games have built in unit and faction lists from their own universe and it’s hard to work around. I’m sure there’s a way. “Here’s how we do it.” 😉