A company's website doesn't usually concern me either way, although I try to determine if the company (if distant from me) is trying to make themselves seem bigger and more successful than they really are.
A well laid out and informative website is important to me as I only personally contact a company when I'm finally ready to cut loose with some cash. So the more information I can pull from a variety of sources the better.
I do agree that some companies can look really professional on the web and turn out to be less than stellar, so I think you're right to take a website with a BIG grain of salt.
Finally, I don't like to call a company and ask a bunch of questions unless I'm ready to spend some cash. One of my personal beliefs is that it is unethical to contact a company ask a bunch of technical questions, get a bunch of information and then go and buy it online some where else a bit cheaper.
