The S2000 is one hell of a capable car, and to this day, out of the tons and tons of cars I have driven I still think the S2000 is the most fun.
As for your race results, it sounds pretty typical. They are very very low 14sec - high 13sec cars with traps in the 101mph range. If you go Cobb Stage2 you should beat him from a dig and hang from a roll.
Either way though, anyone that does not respect the S2000 as a capable and affordable sport car is a fool.