I agree but for example someone just bought kerrysucks.com good name, i webt to overture and then to some engines and typed in kerrysucks and just because that their domain name doesnt make them top.. they are still below others that dont have that , but what they do have is good title and keywords.
I bought kerrysuck.com because that actually scores way higher in overture, with good title in caps on actual page as well as keywords baby will be in top ten...no doubt.
Every site I have ever designed is in top ten just by title and keywords, so all in all domain is very important but sometimes with out proper seo you may be number 20 with alot of non relevant sites in front of you.
also if for example you type in dog .com at yahoo then dog.com is first but if you type in the plural dogs the dogs is nowhere to be found, interesting ...
i did same thing with cat and cats....try it...
so if its a singular generic singular word domain yea, its a sure thing (high chance) but with plurals its weird, serach engines are a mystery.