I was trying to think of which games created certain mechanics that became popular and copied by future games in the industry.
The most famous one that comes to my mind is Assassin’s Creed, with the tower climbing for map information.
I’m not sure I’ve ever had more fun with any game than I did with BF1942. It was just so much fun. There were games with smoother play and deeper mechanics and better graphics, but none were as fun. The dumb mechanics made it amazing, like being able to lie down on the wing of a plane and snipe people while your buddy flew, or dive bombing and parachuting out at 10ft above the ground to capture a point, or shooting the main cannon from a tank into a barracks that has 15 people spawned inside it, or piloting a goddamn aircraft carrier and running it aground to get to a spawn point safely. It was so stupid but so fun.