What's with website?

Well my friends, we are all here because of the internet and web pages,their front doors to the cyber world and our common topic of Audio is a super-narrow niche.

So I have a question - 

What manufacturer's or seller's internet front doors to the web are great?   Which are crap?  And why?

Which sites are easy and fun to use?  Which are torture get what you want?

When someone says "That site SUCKs" what does that really mean?

Thanks