I know what you mean. Blue Team felt tanky, yet functional. The idea of 343i artists to use a basic under suit (techsuit), and have the armored sections attach to give the overall appearance of a Spartan a bulky yet agile tank with legs. Blue Team had very similar designs, with subtle differences that showed their combat specialization nicely. Form following function, and I appreciate that attention to detail.
Chief's armor reminds me of an M1 Abrams tank; smooth, rounded areas, and flat sharp edged surfaces. This helmet has that, almost motocross visor, which could protect his visor and but also serve as an ballistic resistant area yet further protecting his head. The visor itself is very reminiscent of those used by current day astronauts. The gold tint reflecting harmful UV rays from the wearer. These details somewhat ground him in possible future setting, suspending disbelief just a bit.
Where the Chief felt utilitarian, and tank-like, Locke and his HUNTER-Class Gen 2 armor looks sophisticated, and agile. Like an F22 with legs. His sleek, stealth look and the small, wing-like appendages on his shoulders, and legs further accentuate this. While his icy blue visor does look as if it reduces his field of view, I saw a concept art of Locke's helmet that showed the front cowl removed and it continued over the top of the helmet, yet shrouded by armor plating. But I also thought, if his suit is more sophisticated, why would he need a fully exposed visor? Look at ironman, he has two small slits on his helmet, yet his field of view is not diminished. Possibly a full digital display, and not actual field of view.
In short, im probably one of the few fans who enjoyed the new artstyle. Not that the classic was bad, I just prefer the new art design better