Nobody's forcing you to choose Rudy.
Don't like him? Don't support him in the primaries. It's that simple.
The fact that on every Rudy thread there's gnashing of the teeth, the obligatory Rudy in drag photo, and the anti-Rudy spam of past statements simply reveals the lack of confidence you have in the other choices.
Nominating Rudy Giuliani to lead the Republican Party is like choosing Al Bundy to pastor your church.