Behodar:
The complete lack of "polish" in Windows. I clicked the clock to display the calendar. One second later Windows decides to pop a notification up over the top of it, so that I can't see the thing I'm trying to look at.
It was Steve Jobs who said
""The only problem with Microsoft is they just have no taste. They have absolutely no taste. And I don't mean that in a small way, I mean that in a big way, in the sense that they don't think of original ideas, and they don't bring much culture into their products.""
But I do also find Apple can do the same dumb things.
The stupidest thing I have ever come across is Apples bluetooth mouse, you can NOT charge it and use it because the connector is on the bottom...DUH