Sentence examples for are not immediately impressive from inspiring English sources

The phrase "are not immediately impressive" is correct and usable in written English.
It can be used to describe something that does not create a strong initial impact or impression upon first observation.
Example: "While the design of the building is functional, it are not immediately impressive compared to other architectural marvels in the city."
Alternatives: "do not make a strong first impression" or "are not striking at first glance."