It was actually asked of Sanders in the debate and I wasn't sure if he actually responded, but what exactly do people expect Clinton will do for her rent-seeking donor base of employees from JP Morgan (and Corning and University of California and the DISH network and Google) with her Executive Branch powers? Veto regulatory bills?
Personally, I take criticisms of Clinton's donors as part of broader indictment of the influence of money on the political system and the Democratic party in particular.
Speaking particularly about the Clintons: In the 90's, the Clintons - I will speak of Bill and Hillary as a team because they presented themselves as co-presidents to the public and realistically both had a hand in building their rather unique political empire - were instrumental both in pioneering new ways to fund-raise for the Democratic party and in moving the party to the right on a number of issues. One of those issues was the deregulation of a number of industries, finance included. Its difficult not to make the connection.
Looking at Hillary's campaign today, it is difficult for me not to come to the conclusion that she is carefully staking out positions just to the right of the leftmost candidate in the Democratic primary, rather than adopting positions for their own sake. That pattern continues when it comes to the issue of reforming the financial system. I would, more fear than argue, that the influence of Hillary's donors is already reflected in the positions she is taking in the primary.
Really, my views on this topic aren't focused just on the Clintons. If you look at politics in the Western world, particularly in Britain and the U.S., you will see the rise of a certain type of politician during the 90's. That type of politician sold themselves as a "Third Way" between the, then discredited, post-war leftism in Britain and the U.S. and the reactionary conservatism of Reagan and Thatcher. Those politicians tended to reflexively move to the right on a number of issues, and they tended to be very friendly towards industries such as finance and technology.
Personally, I don't much care about what Hillary would or wouldn't do with regards to Wall Street. The fact that Republicans will still control the House means that there will not be any regulatory bills reaching her desk for her to veto. When it comes to people she might nominate to the SEC, Elizabeth Warren and progressives in the Senate will still exist, after all
Still, I wonder what will become of policies like Net Neutrality. I also don't appreciate the attacks on reforms like Single Payer.