From what I've heard from them, I think "better safeguards against regulatory capture" would cover a lot of it, though I have yet to hear that term specifically.
Thank's for introducing "regulatory capture" to my vocabulary. It does seem to capture much of what people are angry about (bailouts, etc.). I'm guessing you haven't heard it used by the protesters, it's because it sounds so academic. If they read the definition, though, I expect many would agree.
For the lazy:
"when a state regulatory agency created to act in the public interest instead advances the commercial or special interests that dominate the industry or sector it is charged with regulating" (Wikipedia)
I'd bet a vast majority of people there would get behind this.