Keep in mind, that "not being as represented" is a whole different issue that being worth what you bid! A seller can say nothing about rust, and he has not mis-represented the car as being rust free. Some of these sellers are experts at knowing what to say and not to say to avoid mis-representing a car!
I have bought a bunch of cars off Ebay and other sites, and while I have not personally gone and viewed every single car I have bought, I at least have someone I know from that part of the country go look at it. There are plenty of knowledgeable people on a lot of discussion boards who will be glad to go look at a car for you. I have looked at cars for many other people as well.
I am almost never buying a perfect car, so I don't need someone to spend hours surveying the car. Most of the cars I buy are project cars, so I am just trying to get a feel for what is there and what is missing, and what kind of shape the car is in. I will regularly buy total basket cases, but I want to pay basket case prices!
There are lots of good buys out there in all conditions from project car to perfect 100 point car. The key is to pay the correct amount for what you are getting. For some types of cars, I have enough respect for some of the people that would go look at the car for me, that I would not hesitate to pay top dollar for a car based on their opinion.