I am currently seeling my S2000 and getting an NSX. I have a good friend and housemate who also owns an NSX that I have driven extensively over the past two weeks.
The reason everyone is being so negative towards you is because you don't actually mention anything at all about actual 'car guy' stuff - you know the things that real car guys look for when they own or are looking to purchase cars like the S2000 and NSX. You didn't compare anything about the two cars like driving dynamics, steering feel and turn in, throttle response, shifting smoothness, engine smoothness, power delivery, solidity, handling biases, braking, etc. No, instead you mentioned that you missed the drop top of the S. In addition to that you connected the convertible aspect of the S to sealing the deal with some chick, and implied that your only regret would be if the NSX doesn't help you pull in chicks like you seem to think the S2000 does.
The negative posters jumped on you because they feel very strongly, like most of us on this forum, myself included, that what you drive is not very relevant to your chick magnet score at all, and definitely shouldn't be something you consider when looking to buy a car.
The S and the NSX were made for the people in the driver's seat, not the person in the passenger's seat or onlookers on the street!