1. Sound effects in Reach are better. Sound effects in 4 were way too exaggerated which caused like, 45% of players to hate it.
2. Armor in 4 is ridiculous. I have like 25,000 players who agree with me.
3. Multiplayer in Reach is more balanced as people can snatch weapons and ammo in the map. In 4 everyone gets their own stupid ordinance that just mixes up the whole gameplay. It's like killing 7 players and getting an Energy Sword when u don't deserve it. Might as well set it like CoD Black Ops II where it requires a 'spree' to unlock scorestreaks. And u still can choose what u want!
4. Absence of human air vehicles in 4 results in most players complaining, while 343 doesn't give a damn. AT LEAST GIVE US A FRIGGIN HORNET SO WE CAN DO MACHINIMA!! Or at least improve gameplay...