He definitely had the raw pace. He looked quicker than Barrichello in his rookie season, and would have outscored him if Hamilton hadn't went for a crazy move in St Devote. I think he was in route to a 6th place in Monaco. Pace was never the issue with this guy. He simply was not adaptable, if things weren't in his sweet spot, he would just overdrive and do very questionable things.
He needed better guidance. Had he been at a top team no doubt would have ended up being an equal to Montoya. Aggressive driver with a below par car does not work. Aggressive driver with a race winning car, he would push it to the limit in clean air at the front.