That wasn't the act that enabled "creative" mortgages, at all, but rather the 1982 AMPTA act. In the context of fixed rate long term mortgages, which the 1980 act demanded, it meant that lenders could provide loans to people with lower credit ratings at higher interest if they so chose. All the normal rules still applied, otherwise.
http://money.cnn.com/2008/01/30/real_estate/congress_subprime.fortune/
None of which would have meant a lot w/o the invention of CDO's by Drexel Burnham Lambert in 1987. They're a wonderful way to obfuscate risk.
http://www.bloomberg.com/apps/news?pid=newsarchive&sid=aTCaFu03ENY8
By the time 2002 rolled around, things were clearly out of control, but Bush Admin regulators and Greenspan's FRB didn't see any problems at all...
http://www.nytimes.com/imagepages/2006/08/26/weekinreview/27leon_graph2.html
It didn't help that Bush's SEC allowed the biggest investment banks to increase leverage in the run-up to the peak-
http://bigpicture.typepad.com/comments/2008/09/regulatory-exem.html
and that the rest of the Bush team of regulators acted as cheerleaders-
http://dorkmonger.blogspot.com/2008/11/cutting-red-tape.html
Who made out? Those with the biggest propensity for double and self dealing, GS in particular-
From the Bloomberg link, above-
Selling CDO's out the front door to investors, shorting the hell out of 'em out the back door with derivatives... It's called fraud and looting, unless you're one of the fans of self regulated free market banking, in which case it's still looting, except that you approve of looting...