Cuban is right in that the Facebook IPO was great in that they sold their shares for higher than what they were worth and maximized the benefit for FB.
But the more important fact is that investors, who are the lifeblood of this entire market, got fleeced, and that's long-term bad.
The people that you do business with MUST have confidence that you will live up to your end of any deal that you make with them. If you're only going to do a single one-shot deal with someone, I suppose it's doable to screw them for whatever they're worth. That seems to be the Wall-Street-style business model that is popular with some people these days.
But if you intend to do business over and over again, screwing everyone you deal with is a great way to go broke very quickly. As well, if you attain the reputation of being someone that is bad to do business with, then you will suffer as well.
Do you think Andrew Mason is going to get as good of a ride on the next company once Groupon fails? How difficult will it be for Facebook to have another secondary if it needs to raise more capital?
My guess is that any new deals underwritten by Morgan Stanley will get a second look-over from any potential investors, given the fact that they really sold some snake oil with FB at $100B.