that's a very technical way of looking at it. i'm not only talking about how a site works in a particular browser but if it's actually good or not.

mainly the sites i have in my mind are sites where you don't choose the service based on the web-service and you end up with a really sucky service that you can't leave. for example: - banks - utilites companies - cellphone carriers - government sites - ecommerce sites (where you're a customer in the physical store)

etc