Kinda why Siskel and Ebert was popular back in the day. Siskel approached criticism as being about trying to encourage film makers to make better movies. Ebert was about indicating whether he thought the audience would like the movie. So they would debate. One of them or both would often be wrong. But from the discussion you could get an idea about whether it’s a movie you might enjoy.

There just isn’t anything like that now. You’re going either hear someone tell you it’s the best thing ever, or it’s the worst thing ever. Someone will review it as if it’s supposed to be art while someone else will tell you if it’s got good action scenes in it. These will all be ones or zeros that are added up to produce a rotten tomato number. We don’t even really know what perspective someone is reviewing something from.

You’re right, it’s all subjective so there’s no way to know whether you’ll like a movie until you’ve watched it yourself.