Some of the changes are really stupid, like Personal Ordinance, perks, etc, but a lot of the changes are also rather good, like multiple primaries, constant sprint, etc. Some things worked and others didn't. At least they tried, so that for Halo 5 they can take the things that worked and improve on them, and leave the things that didn't.
Exactly. They messed some aspects of the game up but they didn't completely ruin it. Some if the things that were implemented were long overdue. With that being said Halo 5 will either be the saving grace for the franchise or will be the final hit in the coffin for the 10 year old franchise.
Or it will be just another stepping stone in the franchise that people will still buy and proceed to ***** about.
Maybe as this is becoming the new trend where people hate a game but still buys the next iteration. --- Every game is overrated because the Internet hates everything and wants anything that's going up to go down. Like a true villain.