The problem with comparing coaches is that each one has a different level of talent - both quality and quantity - with which to work. Would any of you seriously suggest that another OL coach could have turned guys like Steve Rehring, Ben Person, Kyle Mitchum, Jon Skinner, and Jim Cordle into All Americans? Conversely, don't you think that Bollman might have had a little bit more success with USC's lineman the past few seasons?
When you look at Bollman's track record, he turned guys who were not considered to be stud OL - Rob Sims, Doug Datish, T.J. Downing, and Kirk Barton - into first team All Big Ten players (and Barton was also AA), and of course he is responsible for the development of Nick Mangold, who was a first team All American, a first round draft pick, and one of the best centers in Ohio State history.
Let's reserve judgment for another couple of years, to see what Bolls can do with some true talent (and depth) along the OL, with guys like Boren, Brewster, Shugarts, Adams, Mewhort, Linsley, Hall, Longo, and Norwell. If the OL is still having "issues" in 2010 (and I'm really not sure exactly what "issues" they have right now, as it's still too early to judge for this season), then maybe we should question his approach and results.