With entertainment purchases (books, films, etc.) do you like to know exactly what you're getting, before the purchase?

Do you read album reviews? Book synopsis? Film clips? Game demos? I’m not sure what spoilers there are for acts of theater. But the question goes for that too. To know what you’re going to get yourself into, and perhaps save money?
Or would you rather experience them with fresh eyes, without expectations from others?

With music albums, I never feel right purchasing before I’ve heard it at least once through. It seems like music is so subjective, it’s hard to take any ratings or reviews to heart.
With films (admittedly, I watch on Netflix, so I don’t buy individual movies), I like to go in completely “blind,” no reviews, no synopsis or preview clips. If I do see a synopsis, I find myself waiting for certain events to happen and I can’t fully appreciate the movie itself.
With shows, I find myself wanting to learn more and more as I progress through the seasons. I’ll end up doing research on a show-based Wiki, learning about the universe and the characters in between episodes.
For games, I find myself polarizing on either side. There are two upcoming games for which I’m incredibly excited. One, I find myself following every bit of detail, reading the Developer blogs, and watching preview videos for. The other one I’ve done my best to avoid any spoilers for, and I’m excited to see it with completely fresh eyes (which I think is fitting for the game, as you’re leaving an underground vault for the first time, to explore the post-apocalyptic wasteland).