The thing that always gets me about the helmets especially is knowing what it's like to walk around with a helmet all the time. If you're in tight spaces, you end up banging the helmet around on every protrusion above chest level. While this doesn't hurt really, it is both annoying and distracting, and that's with a helmet that doesn't have needless protrusions jutting out at every angle.
The other thing that gets me is the total lack of tactical coloring. One of the things you want least if you're trying to be stealthy is to reflect a lot of light. Garish colors on polished plastic/metal surfaces are going to make sneaking anywhere fucking impossible.