I personally like Halo Reach, but I can tell the difference from Reach and Halo 3. Keep in mind I am not claiming that everyone feels the same way. Just an in depth perception of a gamer who has spent a great deal of time in Halo 3 and Halo Reach. So here it is.
1: The Bloom Effect, seriously? Why? It is such a bad addition.
2: Credit Cap? Whoever made this idea is an idiot. This causes people to play less... What were you thinking?
3: The amount of quitters is ridiculous. Which is part of reason 4.
4: Matchmaking is terrible. Eight random people ( No parties ) 4 are high ranks 4 are low ranks. One team gets all the good people, it happens... Alot. Also you can go in solo and go against a full partied team of inheritors. Seriously? Also you can quit here and there with no real penaltys= quitters.
5: Armor effects are just a mess.
6: No BR. Self explanatory to real halo fans
7. No good DLC.
I'll stop on 7 ;)
There IS good things about Reach and it's still a fun game but it had more potential than this. If you feel there is something I missed post it. I'm sure this has been done before but I haven't been in the forums for about two years so dont try to say this has been posted before.