It's possible that the bad intonation you come across Kendall originates in your left hand, rather on so many Martins as you claim.

Bev and Jerry's post nailed it on the head.

And you can get a dud in any guitar. But living up to an ovedr 150 year reputation as the best, as CF Martin does, and considering the amount of guitars they make is very remote.

Besides, Taylors have no soul and many guitars look pretty stupid without a pick guard.