Its seems in this day and age, the key to making a "good' movie involves having great technical aspects, which allows everyone to overlook any shortcomings (such as the MCU).

The fact that 1917 was filmed in a single scene is analogous to Boyhood being filmed over 12 years. Both technical "marvels", but it doesn't mean that there is actually any substance to either of them.

That doesn't mean that 1917 is bad, it's just another typical movie that happens to have an interesting gimmick.