mediocre, second-rate -- (moderate to inferior in quality; "they improved the quality from mediocre to above average")
average, fair, mediocre, middling -- (lacking 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")
mediocre -- (poor to middling in quality; "there have been good and mediocre and bad artists")
(Sound)
