Nintendo doesn't name Activision's/infinity ward's games.. also, there's very few Wii games that support the GC controller, but a couple of the major titles does it at least ( i think there's a list somewhere, you've heard of google? )
I haven't played CoD: MW - Reflex yet, but i've heard that's quite alot of options and tuning of the controls so i'd give it a try and make it feel better.. i bet you've barely tried the game with the Wiimote, or you simply suck at it ;P
Anyway.. good luck learning to play with the Wiimote+nunchuck!