From my experience watching videos of games before I play them is enough to know how I will like the game. Never had a game which felt totally different when I played it as when I saw it (if I saw more than a three minutes long trailer)
Sure, there are differences between playing and watching but when I see videos of a game which I don't like but it has a high meta of maybe 90+ then even trying the game doesn't bring it close to that score in my opinion. Same vice versa with games and low scores.
But I wouldn't call it overrated just because my opinion is different to the average opinion of many people.