It started ironically but Krillin I ended up liking. It's the classic love for the underdog on one part, and simple respect for the most powerful human on the other. I mean, poor guy was always second to the chosen one of a superpowerful alien race, always focused on what's important, on helping others, on giving his best. And he achieves it. He IS the best... of a certain population. But we all laugh it off because he can't beat near unbeatable demi-gods. Krillin is some sort of a source of inspiration. If you give it your best, you might be the best. And it's not a bad thing that nobody sees it, because you'll have done it the right way.