I just finished a two book series that was objectively awful. It had some of the worst writing I've read, although the world building was great. It has a 4.2 rating on goodreads. If you read the reviews, though, you can see that the 5 stars are just "I liked this fun book!" The negative reviews delve deeply into WHY it was so damn bad.
My favorite series also has a 4.2 rating. The difference is the 4 and 5 star ratings have deep reviews saying why the series is so good.
Going by ratings is a terrible way to go through life.
Also, you view a 3.98 as not good enough? You are missing out on a world of great experiences, even if somewhat flawed.