Instead of criticising advise the problem decision.

Absolutely casual concurrence

You are not right. Write to me in PM, we will discuss.

It is rather valuable answer

In my opinion you commit an error. Write to me in PM.

This idea has become outdated

Very well, that well comes to an end.

It agree, very useful phrase

It to it will not pass for nothing.

Yes, thanks

The nice message

I know a site with answers on interesting you a question.

Yes, really. And I have faced it.

Other variant is possible also

I will not begin to speak on this theme.