To some extent, yes, there is something to be said for the quality of the pitching at the lower levels. Most guys you come across in the various levels of A ball tend not to have a well-developed arsenal of pitches, namely offspeed and breaking stuff, and hitters can have an easier time of things by just sitting dead red on a fastball in the zone in most at bats. It's part of the reason you see guys like Brian Dopirak and Ryan Harvey look like all-world talent in Peoria, then flounder at higher levels. However, there is an important distinction that I think needs to be made. While drawing walks can certainly be learned over the course of a player's career, a player has a much easier time of it if he already has good habits instilled in him at lower levels, be it in college or little league. A guy who displays plate patience at lower levels is going to have an easier time of continuing that as he advances. Harvey and Dopirak never displayed drawing walks as a plus tool in their arsenals. Remember, while the pitchers are not that advanced, neither are the hitters. Both sides need to keep adjusting to one another. So, in my opinion, there is much to be said for a hitter who displays an excellent IsoD (OBP-AVG) at any level.