I've not been able to play much myself but after playing and finishing Halo 4 just before this...the audio seems a little less punchy. However...i may have an issue my end...plus my achievements have stopped popping when I finish a level, I've only done a couple but nothing has pinged.
That said...i still think it will be a lot of fun and really looking forward to getting involved with Warzone.
Lieutenant Colonel - CAG Archangel