Well, now that we've seen the sets out of box and (presumably) finalized, I'm going to give a brief summary of my opinions.
Iron Man - Still looks great. The recolors are many, the set design looks cohesive and Iron Man as a character mixes well with the HF aesthetic. His back armor looks very nice, as does his shoulder-mounted gun, and the head mold actually looks very nice. A (surprisingly) excellent set that holds up well against the HF sets from the summer, in my opinion.
Hulk - ...I can respect the look they were trying to achieve here, and the design of the torso looks... unique, at the very least, But it looks gappy and slapped-together, not to mention the fact that his "power armor" and gunmetal chestplate negatively impact the sets visual appearance. To continue, the fact that his hands lack fingers, while it does give the impression of being fists, also impacts the set negatively IMO. The ridiculously bulky upper body and the skinny lower legs contrast far too much for my tastes, and don't even get me started on the blue pants. Overall, I dislike this set.
Captain America - Mediocre. The set looks well-designed, if a bit bland. His riidculously bulky shoulderpads look... interesting, but the clashing colors are a bit off-setting. And I'm just talking about the shoulderpads. Either make them all gunmetal or all silver. It would look better. And while blue, red, and white is the character's signature colors, it doesn't translate too well into a set IMO. The shield is nice, though, as is the chainmail upper-torso armor. A set I may be interested in purchasing, but at the same time, is kind of generic.
Overall this wave is nowhere near as good as the DC Ultrabuilds, which all managed to turn out to be surprisingly well-built and interesting, though Iron Man is excellent.