Best for me would be Resistance: Fall Of Man, loved it and finished it so many times.
Honorable mention goes to Borderlands One and Two.
Worst would be The Division, I just hated the bullet sponge effect and in PVP it was more of who had the most time to spend on getting the best gearset rather...
I think I've perfected google searches, I'm really good at finding this or that half-remembered bit of something. And then ChatGPT comes along and does it at least five times better.