mediocre
moderate quality
Adjective
This word carries a heavy sting of disappointment. It describes something that is not necessarily a failure, but is frustratingly average. It suggests a lack of ambition or a failure to reach a potential that was expected, making it more negative than simply saying something is average.
In professional or artistic contexts, calling a work mediocre is often seen as more insulting than calling it bad. While bad work can be provocative or a bold failure, mediocre work is forgettable and bland, lacking any distinguishing characteristics or spark of genius.