My opinion is the majority of deer hunters would kill more bucks if they used no scents whatsoever and no calls whatsoever. That's not to say that both scents and calls don't work sometimes. But I do believe most users are confusing happenstance with a false assumption of cause & effect. Yes, sometimes you grunt, and a buck comes running. But how many times does grunting spook a buck you didn't see, one which might have been coming towards you if you had been quite?
I've also had estrous doe urine bring in a buck. But more often, I've seen it spook a doe, which in turn spooked multiple bucks.
Probably the biggest problem is over-use, and use under the wrong circumstances and wrong times, not realizing the deer are pin-pointing your location, when they otherwise might never have been alerted to your presence.