Good question. We could address it (or users can), in a couple of ways.

First, every can be commented on i.e. is essentially the start of a discussion thread. So anyone can add to, correct, or clarify what they read in a review. Those comments can then be upvoted (so that commenters can be rewarded).

If a review is simply outdated, then I think this is the best response.

When companies are playing more of an active role, then they can respond to reviews themselves, and so anyone reading will be able to see the company POV too.

If reviews are flat out wrong, it kind of depends why. Are they obviously misleading? Spamming? Off topic? If so, then hopefully we've caught them before publishing anyway - as they'd be contrary to our review guidelines.

But the short version is: we want the 'market' to take care of it