From what I remember of 2010, the McLaren or Redbull were the fastest cars. The McLaren had a slight edge in top speed, but the Redbull seemed to be better through the twisty sections.
As for "ease of driving", it probably comes down more to driving style...the McLaren IIRC seems to respond better to smoother driving through the corners, while you can wring out the RB5 a bit more and not lose as much pace, especially through corners. The Fez is just a bit off those two, but not by much and needs to be driven with smoother lines.
There's a pretty clear distinction between those 3 and the rest of the field, for sure.
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