In my experience there is a difference between applications that feel 'a bit off' (in that they don't completely honor the platforms interface guidelines but ar

In my experience there is a difference between applications that feel 'a bit off' (in that they don't completely honor the platforms interface guidelines but aren't opposed either), and really user-hostile platforms. In the first, the user interface is fast, stable, and does its job on every platform. The developers didn't have time to make a real native application, but have made sure of usability on every platform. Widget kits like QT allow to get very close to native look&feel. In this case, the usefulness of the software can make up for the non-nativeness. On the other hand, really horrifying user-hostile platforms also exist. I've frequently experienced these in "enterprise software". Makers of such products seem to think that user experience doesn't matter at all. The interfaces, feel bulky and slow and generic, sometimes based on 80s screen scraping, and live in a world of their own, ignoring any user friendliness guideline since the same era. Not even starting about the web-applications that only support IE6... This is not the uncanny valley, this is stuff straight out of nightmares.