I never have understood people hating on walkons. We have had a number of very good walkons come in and help us be successful or even be some of our best players. The walkon program is doing what it's supposed to do. Develop players that didn't get a scholarship from the beginning and make then contributing players for the program. If scholarship players aren't beating them out, it might just be because the walkon worked harder and is actually that good.
I believe the issue, though I'm sure you realize this, is that walk-ons weren't good enough to earn a scholarship on paper, therefore the mindset surrounding them is that they're probably not as talented.
Like a lot of things, there are two sides to this coin. Obviously, you want your scholarship players to pan out so you don't have to rely on walk-ons and feel like you "wasted" the scholarship, but walk-ons have proven themselves to be incredibly valuable players at Nebraska and have even gone on to become All-Americans/successful NFL players.
I think it'd be really interesting to compare walk-on success for the last 10 years, to the previous 11-20 years, to the previous 21-30 years. Compare accolades, awards, draft picks, etc.