You run pretty quickly into the "what is fun?" problem though. I play 6-8 hour train capitalism simulators on my weekends, and get excited about things like comparing partial vs. full capitalization or different auction methods for the initial bid on embezzlement options. I have friends who would rather do just about anything else with their time, while I put at least 20% of a breakup on not being able to stomach another game of Commander with him and his otherwise pretty reasonable friends, because it is a badly designed fan mod to an already mediocre game that should not be popular.
Cool! This "What is Fun?"
is a question you
have to answer! To
yourself.
I'd be glad to continue on your example, but I don't know enough about strategy games to not stumble into something I didn't mean on accident. For this, I apologize.
Of FPS games, I know a lot. There are things that I
(at this moment) find the most fun: making crazy jumps, hitting crazy shots, and utterly dominate my opponent through nothing but practice. No luck, no deception, pure Bliss of a mechanical skill, hard-wired into your spinal spiral.
That I want to distil. I seek games that build walls to insulate me from random numbers that I can't predict, be they born of dice or a complex chaotic system, from sitting in a corner, being passive.
That's why I play Quake, TF2 and ULTRAKILL and not Counter Strike or Call of Duty or ArmA, and if I was to make a shooter of my own, it would be like Quake, but
mine.
Your answer may or may not be different: I don't know. Maybe you enjoy sitting in an ambush (I can see why, I enjoyed it too, but right now I crave speed) and outsmart your opponents rather than outflick them. Then you'll abstract away and simplify things I find fun. You'll give weapons random spread, you'll slow me down, you'll make me fragile. You'll make sure that if I'll end up in a sticky situation, no amount of marksgalship is going to save me. I can't outrun a bullet. You'll seek a game that is closer to Counter-Strike than to my beloved Quake.
Regardless, you should know what you are doing. Understand design, read a subtle language and, thus, be able to act with intentionality.