There are two big reasons why it's so difficult to find new movies on HBO Max with over 90 percent on Rotten Tomatoes. For one thing, that's a rare feat that only a few films have been able to achieve. Movies that hit around 80 percent are more common. HBO Max also adds a large number of classic movies each month that predate Rotten Tomatoes rankings. Regardless, Watch With Us has once again found three new HBO Max movies with over 90 percent on Rotten Tomatoes that you can watch in August.