Yes. A quality signing from a previous club who is not over 32 and past his best i don't have a problem with. It's the Clough-esque style reserve recruiting of former players that is not the way to go.
That would totally depend on who it was. McCall, Speed, Windass were all pretty successful. That kind of player can sometimes make all the difference. I do agree with you on not the kind of players Clough was aiming for though. I still believe there is a quality footballer in Coutts trying to escape though.