Presumption of stupidity
Working in academia, I've experienced this too. I've read work in my field of research that I dismissed as bad work or not worthwhile, simply because I didn't fully understand them. Too complicated, strange background assumptions, not well motivated, etcetera.<p>Then later, while developing my own work, I find that I end up with the same complications, that I'm forced to make the same background assumptions, and I have the same difficulty in motivating my choices.