As you know F3000 don't race every F1 track, plus there's a difference
between driving a track, and driving a track in a particular car. Ralf has
done all the tracks *four* times before *in an F1 car*. JPM has done half a
season in an F1 car and some testing. Champ Cars have slick tyres and
turbos, so it's quite a switch to go to F1 cars.
As for his attitude, he's made one stupid naive comment to Villeneuve in the
middle of a heated argument. Big deal. I remember Michael Schumacher
accusing DC of trying to kill him at Spa, which was even more ludicrous.
Having watched Montoya for the last two years in CART, I think he's an
exceptional natural talent.
Sure he's making mistakes at the moment, but what did Mika Hakkinen spend
his first year in F1 doing? Casuing a shunt at the first turn of every
other race, and now he's a double world champion, so I think it's a little
early to be writing Montoya off completely.