Disappointing but hardly unexpected.
Halo 4 is using a new engine that pushes the 7 year old hardware to its limits; adding true stereoscopic 3D would have probably led to really low res graphics and using reprojection would have just been a waste of time. Adding 3D to Halo Anniversary probably wasn't all that hard since they were still basically using the old Xbox engine designed for last gen hardware with a layer of wallpaper on top of it.
The God of War Collection is really just a repackaging of existing games and its obvious that its more of a marketing ploy by Sony to milk a few more bucks out of those games before the next GoW game is released than an attempt at enhancing those games in any way as there is no new content at all within the games (Ditto for the Infamous collection).
Xbox Live: XboxPhantom