I also try to ignore the best and the worst. Another similar tip is to pay more attention to people who have posted lots of reviews, good and bad, over time (including what TripAdvisor calls "Top Contributors"). These people are less likely to be fake.
Also pay more attention to the more recent ones than the older ones; older ones are worth looking at if they are at a similar time of year to when you plan on going (not only date-wise, but also religious and other local festivals).
Also try to figure out if the reviewer is similar in nature to you. Similar age, income, worldview, etc. After all, for the purposes of their review, they are your proxy at that location - so, if they're nothing like you, their review is not going to be as helpful as if they are very similar to you.
That said, also look for common things popping up in lots of reviews. E.g. we were looking at one lovely tropical hotel, and lots of reviewers complained about the seaweed on its private beach. Having lots of independent opinion on this was useful - more useful than if only one person had mentioned it.
Also in the summary area at the top of the reviews, check the type of reviews (family, couple, business, solo, etc.) For example, if you're looking for a nice romantic hotel for a couple and most of the 5* reviews are from families, then it might be the very opposite of 5* for you ...