I tend to ignore 5 star reviews, and read 1 and 4 star reviews.

The 1 star, for the reason you mentioned, and the 4 star because they tend to be more from people who have actual issues that keep it from being 5 star, but aren't petty and saying "everything sucks" because they felt like their waiter was 15 seconds late on a refill.

If I see enough 1-stars saying the thing breaks quickly, etc. I pay attention to them. Also, the ones that say, "I should have paid more attention to the poor reviews."