it's enough if you want to replicate the look of super 8 but not even close to 35mm.
Hey squig, I'm quoting you again. Neither the CineAlta nor the Genesis nor the Viper nor anything else currently can replicate 35mm film. If the D90 has the exposure latitude of 8mm film as you seem to claim I'd reckon that was a selling point, because a $3000 camcorder doesn't!
But if it's an analogy, there were plenty of underground films shot on 8mm e.g. A Polish Vampire in Burbank, and with 8mm alumni like Derek Jarman and Sam Raimi, how can you go wrong?
I know I'm guilding the lily here, and I imagine you're coming at this issue from a more strictly professional level. But for some of us, who are not professional, what the D90 can do is very useful.