I do feel like punching people in the face when they put Halo anywhere near the toplist of games, but Halo 3 was Halo's central design mechanic refined and placed in massive spectacular levels with superbly maintained online play (albeit with the idiots on live) and great features like forge and that camera mode.
It's far from the game that some people will tell you it is but it's a solidly made console FPS with spectacular moments and fucking COLOURS, which is rare in modern games.
While we're on CAD, sure he can draw a train but that fucking copy and paste art:
cad.gif