I disagree with you, Sprint makes you move faster than the default speed and that is the point of it, so that you can get away from other players. Also, lots of people still fall for Hologram, not as often as in the beginning but it can be effective occasionally. However, I do agree that I liked Active Camo better in the other Halo games but mainly for the reason that they added a Radar Jammer effect because that completely gives away the player's position. But I am glad that they toned it down with making the user slowly becoming visible as they move helps since in the other Halo games it was abused and anyone using it usually had a major advantage. Also, Overshields was not replaced by Armor Lock, Overshields can still be made in Forge and are in some custom maps. Also Bubble Shield was majorly upgraded, I think that Drop Shield is far more effective because it heals and protects.
However I hope that in Halo 4 they use both Armor Abilities and equipment together.