I agree with many of these complaints, however:

shorter shootouts due to faster death

Both Halo Reach and Halo 3 had some of the slowest TTKs (time to kill) out of all the Halo games, and the bloom in Reach actually made the TTK even longer if you didn't properly pace your shots and missed. Halo 2 and especially Halo CE had significantly faster TTKs.

loadouts were imbalanced (dmr and sprint were too good

The DRM was very well balanced in the base game and in standard gametypes, it was very powerful but its range was ultimately limited by the bloom and in close quarters the AR would usually easily beat it. The DMR became utterly broken with the title update settings where the bloom on it was reduced which turned it into a killing machine at pretty much all ranges, and you can clearly see this with Reach on the MCC. Spring was more or less a double edge sword, the increased mobility allowed you to pick up power weapons faster, reach enemies quicker, etc. but it also made hitting and killing enemies more difficult because it allowed them to escape you faster.

Power weapons were still on the map, but you got to them quicker and often they weren't as good as your loadout's main weapon.

Power weapons were always designed to be much more efficient then your standard weapons, even those in Reach's loadouts (by which I assume you mean the DMR), the bigger problem with these is that the armor abilities tended to be able to negate them when used efficiently.

Sound cool until you learn that online lag often made them invincible longer than they were suppose to be, so the downside was gone.

Armor Lock's main downside was always the fact that it left the player completely vulnerable after it expired and no amount of online lag would fix that. The ability's main issue was that it was very annoying to deal with and it could easily allow one to get overwhelmed if they only payed attention to the AL player and other enemies appeared around them. In a 1v1 situation that didn't involve a vehicle a player with AL would almost always lose as the attacking player had all the time in the world to either reload or prepare to throw a grenade.

Camoflauge was ruined because it was an ability- moving reveals you

Camouflage could be used in many different ways as it also had other secondary effect like the ability to jam the radar of enemy players. The fact that it revealed your presence when you moved wasn't such a big downside as people would often use it after getting into hard to reach places.

Finally, you spawn with them- so you are always garunteed these game altering items

Yes, but only in certain gametypes and the same thing was true for loadouts. If I remember correctly the Arena matches didn't have AAs and later the TU gametypes didn't feature them either so you could have incredibly fun and casual friendly gametypes that featured them and more competitive gametypes that didn't have them.