The pluperfect is used to indicate what is relatively earlier than the compared clause. But in conversation I hear people omit it all the time. Examples:
I haven't spoken to the President since the inauguration. We had a few conversations before that.
vs.
I haven't spoken to the President since the inauguration. We'd had a few conversations before that.
Or,
The incident occurred yesterday, but things started deteriorating before that.
vs.
The incident occurred yesterday, but things had started deteriorating before that.
If I were writing something I would take care to include the pluperfect, but in conversation I often don't have time to do the comparison. It seems to be omitted a lot by people. Am I correct in this perception?