BadWebpages2
The worst web page I (never) encountered belongs to a CRM vendor. I understand they may possibly have a good product. However, every time I tried to access their website I ended up immediately at macromedia.com. No helpful messages. No warnings saying "you don't have Flash installed on this browser". No HTML version of the website. Just a blanket refusal to talk to me and immediate redirection to a completely different site with no apparent relationship to CRM.
Eventually, I emailed the account manager who forwarded my problem to the helpdesk. They refused to consider this to be a problem. As far as they were concerned, every user in the world always has Flash installed and working all the time, and the whole thing was my fault.
Ever since then I have made it my business to disable Flash on every browser I use. And to try and avoid this company's product, of course.