Enterprise software does not put a huge priority on attractive graphics and "discoverable" functionality, because people who use it very often tend to perform the same transactions over and over and over. Efficiency in this use case is far more important than e.g. something like HipMunk where someone who's never seen it before should be able to figure it out without any help.

I was recently at my insurance agent's office updating my automobile insurance coverage. The agent worked on a mainframe character mode interface and could absolutely BLAZE through the various options and quote different insurance options instantly. No dragging and dropping, no pointing and clicking -- her hands never left the keyboard. Looking at the screen, nothing really looked very pretty or intuitive. The system clearly would require some training or at least some instructions to learn how to use it. But it works really well once you invest that learning.

Then there are people in the enterprise who have to use this software occasionally... e.g. people who have to file an occasional expense report, or update their tax withholding. For those people it sucks, because there isn't a lot of hand-holding, and the software feels clunky and arcane.