Call of Duty®: Modern Warfare® 2 (2009) system requirements
Playing MW2 on a standard controller is a game of aim-assist. Playing MW2 on the Wii with the Wii Zapper (or just the remote/nunchuk) is a game of skill . The Wii version utilized a "pointer" system. By aiming the cursor at the screen edge, you turned. By snapping the reticle to a target, you fired.
(For archival purposes) Redump.org maintains the correct hashes. Many "scene" releases with tags like [Wiimmfi] or [60FPS] are circulating on archive.org. Look for versions labelled v1.2 (the final patch that fixed the Javelin glitch).
In conclusion, while the HD versions of Modern Warfare 2 will always be the definitive way to experience the narrative and the classic multiplayer maps as they were intended, the Wii version should not be dismissed. It offers a unique, immersive control scheme, a technically impressive stable framerate, and a raw aesthetic that distinguishes it from its counterparts. For those willing to look past the resolution count, the Wii ISO reveals that Modern Warfare 2 was truly a great game, regardless of the hardware it ran on.