I find it rather underwhelming.

Meaning

I find it disappointing or less impressive than expected.

Examples

• John: So, how did you like the concert?
• Alice: To be honest, <b>I find it rather underwhelming</b>. I expected more energy.
• John: I know, the sound quality wasn't great either.
• Alice: Yes, the whole experience was a bit flat; <b>I find it rather underwhelming</b>.