@Joanna85
Let me see if I'm understanding what you're saying...
You are looking at a host's reviews, and while he has a lot of good reviews over his history of hosting, his recent listings are not so stellar? And you're concerned because his profile still shows the old reviews, even though those listings are inactive?
To me - that's wouldn't me concern at all. When a user searches for a listing, the preview and listing only show reviews specific to that listing. If they want to see those other reviews, they'd have to go into his profile, and then each review is notated with it's appropriate listing.