Its not my fault some of you guys can't seem to look *up*, much less shoot *up* at the player with the unmistakably loud jetpack in the air, devoid of any cover and exposed to half the map, moving in an easily predictable arc. Jetpack wearers take tremendous risks and make for easy targets to pop out of the sky.
Never saw the problem. Jetpacks have also been in the lore from the beginning, and Halo Reach finally brought 'em into the mix, thankfully. Designers who don't want to consider the movement possibilities inherent in a game with jetpacks should stick to designing levels for games without them.