The sign of a good game is when you sway about in your chair as you leap a gap in a ravine and keep falling off , you look behind the monitor for the sniper you can quite see , lean forward as you fall.
These things happen because your not playing the game , your in it !
Half-tempted to say "Gundam Evolution" if only because that game and GBO2 will be the next best thing in terms of Gundam games on PC. I might be a bit more biased towards Evolution personally, since twitch shooting with a rocket launcher is more my cup of coffee.
My only gripe is that the OG Gundam looks like a joke compared to the combat performance of the RGM-79 GM
Experienced players don't waste time going for 4, since the cookie drops after 3! As long as you win the boss fight v the Cookie Monster in Quake 3, of course.
There's only 1 cookie, but you could—altho I hesitate to promo this—go for 5, and then pay $15 for entry into a drawing for a NFT of the ultra cookie—the one with the choc chips. Great value if you win—no crumbs, no going stale, no melting onto your fingers…
I'm gonna answer it with full bias and say Team Fortress 2. Unique and amazing characters with personality, same thing goes for the weapons, lots of HATS, active community and above all the game has stood the test of time.
Right now there's a huge cheating/bot infestation problem in the game but if Valve does something about it in the future, I can easily see the game going strong another 10+ years in the future.