He just was, though. The numbers aren't comparable, but F1 isn't a stock series so to a certain extent you have to leave them in the bushes. The Williams was the third best car in 2003 but he still put up a title fight, much like Senna in '86/'87. Could you not say that Senna was seeing Prost/Piquet/Mansell back then, even with taking everything that happened after out of the picture? Montoya was a beast. He was looking fraudulent in the first half of 2005, but again once he got to grips with the car he was doing it again.
Now, Montoya isn't going down as one of F1's all-time greats like Schumi is, but for that period of time he was as good as anyone.
You may as well have just walked into the thread saying you know nothing.