You should look at what role they were bought for. Carroll was bought as a cover for Barthez, didn't cost the earth. Was an OK GK, nothing more, nothing less, backup material. Ricardo was the same(although I'm not sure how good he is), concede a penalty every game, and saved them every time. That must have count for something. But like Carroll, backup. Barthez was very good for us, was for a season and a half. After that that circus bug got to him. Bosnich was free, didn't really have a choice that time with him missing out on VDS. Taibi was bad though. A few games, and he's gone.

Best I've seen is the Big Dane. Others no comment. Yes he makes mistakes, but so do the other 'top' GKs. Look at Cech.