let me say
let me (just) say
Used to politely introduce and highlight the importance of some opinion or fact. On behalf of everyone here, let me say how thrilled we are to have you joining our team. But before I go, let me just say that this is the most poorly run company I have ever worked for!
let me (just) sayand just let me say
a phrase introducing something that the speaker thinks is important. Rachel: Let me say how pleased we all are with your efforts. Henry: Why, thank you very much. Bob: Just let me say that we're extremely pleased with your activity. Bill: Thanks loads. I did what I could.