Am I missing something? I guess it can be rather subjective, but I don't have any complaints about UX or UI.
I should add that I've been told I'm too forgiving of bad design, so this is a legitimate question. I really don't see anything wrong with the UX from any of their products that are in common use.
I did have occasion to use one of their search appliances and the UX wasn't bad, but the results were pretty terrible. Terrible results might qualify as bad UX, I guess?