Though deer on pressured areas may adapt danger to calls, I adamantly disagree with this as a whole with obvious results.

Per Greg's posting,

I've rattled in 3, or 4 in 26 bow seasons, and imitated the can with good results on several. I even rattled one back that I missed by banging my aluminum arrow off my riser and stabilizer. That's right.

Like Greg, I've scared more bucks than I've called in rattling.