In my opinion: MGS4 > Gears of War 1, by more than just graphics. Story, gameplay, music, sound, etc...
Edit: but honestly, they really can't be compared.
- 2010 MUST Haves: WKC, Heavy Rain, GoWIII, Fable III, Mass Effect 2, Bayonetta, Darksiders, FFXIII, Alan Wake, No More Heroes 2, Fragile Dreams: FRotM, Trinity: SoZ, BFBC2.
- Older Need To Buys: Super Mario Bros. Wii, Mario Kart Wii, Deadspace, Demon's Souls, Uncharted 2.
There is definitely more to list that I want, but that's my main focus there.