No one's. Everyone sucks. Find a product and you'll find a population collating complaints about it. Whining about interface design is like the cheapest form of shared currency in our subculture.

Fundamentally it's a bikeshed effect. Complaining about hard features like performance is likely to get you in trouble if you aren't actually doing the leg work to measure it and/or expert enough to shout down the people who show up to argue. But UI paradigms are inherently squishy and subjective, so you get to grouse without consequences.