Most disappointing Sires

[Linny]

He had El Condor Pasa and Lemon Drop Kid early in his career, but (at least in the US) has not seemed to consistently sire high quality. He still sells well but I would have expected him to have sired more multiple GSW's and more candidates for year end honors over the years. being by Mr P, I'd have expected more dirt success.
I guess I'd say he's not a failure, but he hasn't lived up to my expectations.

BTW, how do you define failure? If a horse who is only moderately bred is a top racehorse but doesn't sire much (think Skip Away, Tiznow, Silver Charm etc) is he a failure? In most cases like those, breeders really don't expect that much anyhow. To me a failure is one with the pedigree, race record and conformation who just don't sire anything of note. Citation is a classic example, though history did prove Bull Lea to be a terrible sire of sires. Nashua didn't sire much either, in terms of top class colts but his fillies were great producers. Surely breeders expected more of him. By this standeard Coronado's Quest and Dayjur (both champs, well bred and built) jump to mind. They were well supported with good mares and stood at top farms.