I played this COD for the PCSX2, on normal difficulty.
the controls were a bit stiff, like any PS2 game from that era, some weapons are kind of buggy, like the grenade which requires you to be right next to the enemy to hit, heavy machine still powerful in Miller hands and for enemies too, weapons aiming have no recoil, but when you take the aim off recoil appears for no reason. I enjoyed the game and finished it in two days.
I plan to finish COD 2 Big Red One as well.