Phrases Expressing Likes and Dislikes

I find it rather underwhelming.

C2

Meaning

I find it disappointing or less impressive than expected.

Example sentences

John: So, how did you like the concert?

Alice: To be honest, I find it rather underwhelming. I expected more energy.

John: I know, the sound quality wasn't great either.

Alice: Yes, the whole experience was a bit flat; I find it rather underwhelming.