According to this, it looks like Bo currently has 2 more wins than TO did in 4 years, 5 more losses and no ties (TO had 3). Since OT didn't exist, you could venture that at least one of those ties would have been a loss.
So really, he's not that far off of TO. Not that I really think the two eras can be compared. They can't. But the Bo haters do need to pipe down.