I forgot which magazine it is, but they do the 0-100-0 mph test, and the Enzo beat 3 other cars in the comparison... I believe they were the Porsche Carrera GT, the Saleen S7, and in dead last, the Mercedes.
In a recent Motor Trend (I think it was MT, or it might have been C&D), they were talking about the Bugatti Veyron. The guy who was speaking about it happened to work on the SLR. He stated that the Bugatti was much like the SLR, but better. He said, with the SLR, they made a show car and said "okay, now build it." Not the way to build a performance car.
I've just never liked that car at all, and I think it's mostly due to the fact that it shares the (nothing short of) legendary McLaren name while delivering middle-of-the-road performance (not to mention love-it-or-hate-it styling). The F1 was undeniably top dog when it came out. The SLR, very much not so.