Could have been better.
 → 그저 그랬어.

[예문]
A: How was your trip to Tokyo?
   도쿄여행어땠어?

B:Could have been better.
   그저그랬어.

A:Why? What happened?
  왜? 무슨일이 있었어?

B:Well, when I was there, it was a rainy season.
 글쎄,내가 갔을때가 우기였거든.