I guess your point is the Senators should not use their own intellect in deciding their vote but should just say "whatever"..right? What's your point..that Lott and Hatch acted properly and they should continue to use that logic? Why are they there then if their vote is predetermined by the President? We could just elect signs and glue them into the seats in the Senate chamber.
Our role in this whole affair was done on election day. We gave that power to the President of the United States. At that point, our constitutional obligations were ended.
Their JOB is to legislate. The whole advise and consent deal was to make sure that corrupt persons were not nominated. Read the constitution some time, it's only a few pages long, written quite clearly, as a matter of fact it was written so the average American could understand it. It is due to legislative and judicial interference that it's made to seem complicated.