If you describe something as mediocre, you mean that it is of average quality but you think it should be better.
例句
His school record was mediocre.他在学校成绩平平。...mediocre music.不尽如人意的音乐
英汉词典释义
adj.
平庸的;普通的;平常的
mediocre work平庸的作品
英英词典释义
Adjective
1. moderate to inferior in quality;
"they improved the quality from mediocre to above average""he would make a poor spy"
2. of no exceptional quality or ability;
"a novel of average merit""only a fair performance of the sonata""in fair health""the caliber of the students has gone from mediocre to above average""the performance was middling at best"
3. poor to middling in quality;
"there have been good and mediocre and bad artists"