I find it funny that you specifically mentioned Halo 4. I actually found the Halo 1-3 main theme to be quite memorable, and it has a guitar riff i could recite from memory easily, and I didn't even really like Halo that much! Perhaps you should actually listen to it before you badmouth it, BenYahtzee Croshaw said:Your Game Music is Bland and You Should Feel Bad
Yahtzee speculates that using full-blown orchestras to make a triple-A game's soundtrack doesn't help that game stay memorable.
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In fact, there are quite a few modern videogame songs I enjoy. Blizzard always does a fantastic Job, and the wings of liberty main theme is something I really appreciate. I also find it a bit insulting that you didn't consider valve. "Still Alive" has been a nerdgasm since it first came out.
Other modern videogame themes I know and think are great:
Battlefield 1942 loading theme
Katamari on the Rocks
Everything from the Sam and Max telltale games!