まあまあだった

was so-so

→ まあまあ
phrase Rare #36,881
was so-so Describes something as average, mediocre, or fairly okay. The exact nuance depends on context and tone.
JA: 試験の結果はまあまあだった。
EN: The exam results were so-so.

彼女は音楽の才能まあまあだった

She was fairly talented at music.