Well, the tricky part about ppr is that it doesn't show the whole picture.
The first thing that distorts it is what people call a putt. Some call it anytime they use the putter (I then argue that if they hit off the tee with a putter, it's a putt, right?). The PGA tracks a putt as any stroke made on the putting green,
and every stroke thereafter until completing the hole. In other words, if you putt off the green with your first putt, chip back on, and hole out, you 3 jacked, according to the PGA.
The latter is how I track my putting.
That said, I'm a 27 hcp and take 36 ppr (well, ok, 36.53, but who's counting the odd 3 jack?
)
The other 'knock' against ppr is that it doesn't take into account where you're putting from. I average 36 ppr, but hit only 4 GIR. In other words, I can't get up and down to save my life. If I 2 putt every GIR, and get up and down 50% of the time (a realistic expectation with short game practice), then I would only take 29 putts per round. Sounds Tour!
The stat I like more is ppGIR. In this category, I score 2.2. In other words, I occasionally 3 jack, but more often than not, if I'm on the green, I'm making par.