Mark Webber was left frustrated and disappointed on Sunday when, despite taking over as leader of the drivers' world championship, he claimed his Red Bull team had failed to perform in the Italian Grand Prix.
The 34-year-old Australian finished sixth after dropping from fourth to ninth on the opening lap, but claimed he and his team-mate Sebastian Vettel should have done better and won more points.
Vettel finished an unexpected fourth after a strange race in which he said he lost engine power, but recovered and then utilised a late 3.3 seconds pit-stop to ensure a strong finish on fresh tyres.
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Hamilton, who had led the standings by three points, crashed out on the opening lap and failed to score for McLaren.
Webber said: "We underperformed as a team today. We could have capitalised and got more points, but we sniffed around just getting a few.
"It's a bit disappointing, but at least we got some (points)."
Webber said he was also disappointed to find himself trapped behind him German rookie Nico Hulkenberg of Williams in the closing stages when the younger man several times cut out chicanes without being penalised.
He added: "Yes, obviously I lost a lot of time behind Hulkenberg.
"He spent every second lap going through the chicanes.
"The stewards did a hard job on him... they left him alone, so that was interesting.
That was my race."
And he added that he was anything but elated at regaining the leadership of the world title race.
"No, it was not good for me. You've still got to make the most of opportunities, so it wasn't the best day. We should have done a lot better."
Webber now leads the championship by five points. He has 187 ahead of Hamilton on 182 with Sunday's victor Fernando Alonso of Ferrari third on 166.
