In my experience, RPR take far too literal a view when compiling their figures. Their overall approach lacks subtelty, imo. In their defence, they have to produce a mark for every runner, whereas I have the luxury of being much more selective....but this does give their figures a 'mass produced' feel, and therefore not something I place any stock in.
If they took too literal a view of the form, wouldn't they have assumed HDO had run to form?
I too think my selective approach allows me to have more confidence in my own conclusions but I'm open to others' interpretation being more accurate at least in some races.
I often look in at the handicappers' blogs (they haven't done any this year so far) to see how they're thinking and to see to what extent I agree or disagree.
I think Euro mentioned Hey Big Spender earlier. That's an interesting example. When he won a couple of runs back I concluded that the race fell apart off an over-fast pace and he mopped it up, not having to do any more than his previous best no matter how impressive it looked at the time. RPRs went much higher for him, taking the form more literally. His next run (behind TYM/HDO) offered strong evidence that his form was indeed better than I'd thought; that he might indeed be, as his stable had claimed, better than ever this season.
But Euro might be right and my original assessment would have been along similar lines but I reckon taking other lines from the race into account that on the balance of probability HBS is closer to the RPR from the earlier run. He OR had gone up quite a bit for that so the official handicapper had agreed. I think the correct figure is below that and above my original one, otherwise I'd be looking at pretty moderate ratings for TYM and HDO, which I'd be very uncomfortable with.
I'd never say I wouldn't place any stock in their ratings. I can be dismissive at times of Tf's ratings but I'm still curious regarding how they arrived at them. Likewise with ORs and RPRs. Looking at them all with an open mind, I reckon, helps me see a range of possible evaluations from which I can arrive at one with which I am the most comfortable.