[kgeist]

I've witnessed it multiple times during our UI/UX meetings that the engineers present there (representatives of the engineering team are invited too, to tell whether it's going to work with our current architecture/deadlines etc.) often give more insightful feedback/criticism on UX than the other members on the UI/UX team (why the stuff looks crappy, makes no sense, hard to use etc.)

I think the reason is, devs view a design from the perspective of a simple user, they see it with fresh eyes, while the UI/UX team probably spent too much time tweaking the design to the point they got used to it and all its quirks and stopped seeing anything wrong with it.