my single biggest gripe with Halo 2 occurs during the first level.
About halfway through, the audio gets really muffled. I've played through several times, and it comes on in different spots, but it happens every time.
It's very odd. it's like your gunshots are being made from underwater, but some of the voices still sound normal. I thought I was going nuts the first time I played it.
And no campaign downloadable content? Someone fix my ending, please!