I only got suckered into eating at White Castle because there was a guy in our group named Harold and it was too enticing not to make some kind of "Harold and Kumar" play while perusing Fremont. Photo op aside, it was a pretty disappointing experience.
Long lines, bad food that's as good on-premise as it is microwaving at home, being accosted by panhandlers inside the restaurant, etc...makes it a highly skippable affair. If you're only in Las Vegas for a handful of days, don't waste your time with a subpar meal here.