He performed so-so during the tryouts, and the coach was undecided whether to add him to the team or not.
If you say that something is so-so, you mean that it is average in quality, rather than being very good or very bad. Their lunch was only so-so = average. neither very good nor very bad = average
neither good nor bad; "an indifferent performance"; "a gifted painter but an indifferent actor"; "her work at the office is passable"; "a so-so golfer"; "feeling only so-so"; "prepared a tolerable dinner"; "a tolerable working knowledge of French"