It's not up to standard.

Meaning

Something doesn't meet expectations.

Examples

• John: How was the restaurant?
• Alice: To be honest, <b>it's not up to standard</b>. The food was bland and the service slow.
• John: Oh dear, that's disappointing. Did you complain?
• Alice: Yes, but it didn't really help. I still think <b>it's not up to standard</b>.