COD2 is so much fucking fun. But in terms of favourite I got to say the original Black Ops. Had that on the DS and PC (still do on PC but I got that port years later), and holy shit did I spend hours on the DS version when I was a kid. On the bus my buddy and I would take turns beating the missions. Good times, man. Good fucking times. That armory was a pain in the ass to unlock though 🤣