I think RT above has made a fair point that you are on a 350z forum and people here love their Zed's to bits... dont think you ll hear much other way around! Having said that I dont own a 'Z'... YET... so I can give an unbiased opinion (I think). I think its the best sports car in the world given the price tag it comes with. Period!!
The reason for your friends opinion I guess could be either he cant afford one so grapes are sour, or he definately knows that its a superb car and he dont want you to own one!