The Disney+ adaptation of Secret Invasion did little to capitalize on its strong premise for a variety of reasons. This came to a head with the series' finale, which compounded the very issues that diminished the story's overall impact. As a result, Secret Invasion's finale earned the lowest rated yet, with the reception being particularly icy for both the episode and the show itself.
Source:https://www.cbr.com/secret-invasion-low-rating-explained/