I agree that the colors, though odd at first, absolutely work well on this figure and from the pictures look well done. It seems that the armor designers at Marvel actually knew the right ways to mix up the blue and orange in a way that didn't look too "messy". One example I can think of is the top air brakes/flaps. Every armor that's used these in the past has had them 2-toned where the small flap separates from the larger one but with Disco it's all orange which helps, In my opinion, the armor colors look less "busy" or "confused".
What I disagree with is your assessment of previous HPP paints. If you're simply talking about the "sheen" then look at Gamma, a simply beautifully painted armor that's not only got the sheen you're talking about but a repaint that is superior to the original (Striker). If you're just speaking to the Mk. VII parts on Midas, the Mk. IX is a good example of a HPP armor with "sheen". It wasn't a popular figure, likely because of having to buy Potts, but it has this weird red that almost seems like there is metallic orange mixed into it. Maybe I'm just not understanding what you mean by "other versions I've seen of this armor really turned me off with their sculpts and color" because aside from the not-yet-produced Mk. XII, Disco is a complete kitbash of parts. The figure uses parts from the Mk. VII, Hotrod and Shotgun. Obviously Mk. VII parts can be found on numerous HPP armors and Hotrod is basically WM2/WM2.5 & IP. Shotgun parts will be used on future HPP releases.