Yes, I rated him based on people who pitched 160+ innings. That helps leave out people who don't pitch much and can skew things.
As far as 1.27, yes that is pretty average. However there are people who are more likely to give up ground balls as opposed to fly balls. That may not mean much, after all the best pitcher in baseball Santanna gives up about a 1/1 ratio. So you can succeed either way.
Calling him a 1.27 G/F ratio pitcher is not really considering the whole. It was the fluke year, and while his ERA was fluke also last year in reference to his career numbers, it was his ERA in Coors that really changed greatly. He is probably between 3.50 and 4 ERA. But as has been pointed out by many, he is an inning eater. He is probably never going to push for ERA titles, but then he is not being asked to be an ace.
And yes there are two categories to pitchers, ground ball and fly ball pitchers. Where you break them down is up to you. But he was also one of the best at NOT giving up HRs. Another way to rate pitchers and their effectiveness. And he was better than Roy in that area in 06 as well, 17 vs 18. When you add in the fact that he pitched in Coors for 1/2 his games, that is extraordinary in the good area.
I think you are really being closed minded when considering him. He isn't Pettitte or Clemens, but he is better than you are giving him credit for.