Halo 4 receives a title update today that should alleviate some grievances players may have been facing.
A blog post from 343 Industries details some of the changes included in today's downloadable update that tweaks the game and fixes some issues with gameplay. They also go on to say that they're already working on the next title update.
The download fixes some issues like glitches after reloading, missing DLC for multiple profiles on the same console, and missing credit after completing challenges. For a full list of the tweaks and fixes, check out the 343 Industries blog.