yeah my experience is that all of a sudden you have to rank your favorites. like:
"a mighty wind was awesome"
"well i would say waiting for guffman was the best, followed by best in show, and then a mighty wind."
i don't think it is exclusive to christopher guest movies though. i mean everytime i bring up how much i love Spaceballs around my roomate he HAS to mention that it is nowhere near as funny as "Blazing Saddles."
or if i mention "Jay and Silent Bob Strikes Back" then he HAS to mention that it is not anywhere as genius as "Clerks."
that type of stuff.