I stopped using that site after realizing I barely ever agree with them.
What's worth having, if you actually care enough, are people that you consider smart media interpreters on deck if you need some help navigating how you feel about something after.
As to RT, Metacritic, etc. that seems mainly beneficial for those with little time to actually decide. And if you have kids, you're probably going to end up seeing a fair bit of dross anyway.
Most good reviewers don't go into plot too much or spoiler-y. The ethos at RogerEbert.com is to help people make informed decision. Same for those sites targeted to parents.
The trailers are all marketing, to hit people over the head over and over again. Not to mention commercial tie-ins that ruin things (looking at you Black Panther Lexus commercial during the Olympics). It's funny that advertising costs have actually increased for movies in this era of pretty much free buzz via social media platforms.