H3 had its flaws but what I really think it finally perfected were vehicles and I think H4 should emulate H3s vehicle dynamics in H4 . Their controls, power, vulnerabilities all IMO opinion were the zenith of Halo vehicle combat.
BRs could kill hog gunners and chopper pilots.
AR spray could take out banshees, but could be countered by good pilots
Tank while beast could be taken out by coordinated efforts by other vehicles, but was still a tank but not the god vehicle of vehicles like it is in reach.
Ghost whiel weak to all other vehicles could slaughter infantry with cannons and not be taken out easily by 2 guys head on with dmrs (as in reach)
Chopper could dominate a match but it took skill and had plenty of vulnerabilites like stickies, rear BR fire, and well placed frags.
It was all useful but all balanced and counterable. Vehicles were power weapons but not insurmountable. It was also interestign how vehicles in and of themselves had their own separate skill gaps. It was always a blast playing 50s who knew nothing but BR rage at my skilled piloting of a chopper and shoot in vein at its front with BRs. In reach i just feel the vehicles are so toned down that the skill gap is gone, Id really liek to see it return in H4. For these resons i would liek to see H4 follow H3 in the vehicles department.
The only thing i think Reach did right in vehicles was with the wraith (finally useful but not OP) and revanant which is fun and balanced and an interesign fusion of ghost and wraith + the passenger is a nice add (though i think it can coexist with the chopper since both operate very differently)
From CE first person hog passenger and tank riding.