Halo Reach:
The good
Netcode, hitscan, feedback, ZBNS MLG
The bad
Bloom, shitty maps, jetpack, armor lock, camo AA, sprint, loadouts and AR starts
Halo 3:
The good
Agility, some excellent maps, BTB I guess?
The bad
Spread, non-hit scan BR, bubble shield, regenerator, flare, turd movement speed, AR starts
Halo 2:
The good
Mostly godlike maps, it was an arena shooter first, hitscan, agility, movement speed, objective gametypes that made sense
The bad
Hackers, cheaters, boosters, modders, glitchers, SMG starts
Halo 1:
The good
Driving warthogs at each other at full speed on Blood Gulch to see how high they would fly up in the air
What about H4 ?
Ps Glitching was nice in H2