To me the crucial difference between the Bern/Hill camps is that accepting corporate money and rubbing elbows with moneyed interests is considered acceptable and 'just part of the game' by the latter. If you're okay with those rules, Bernie's arguments about how awful it is probably ring hollow -- and furthermore, you probably feel like the party would be conceding a chance to win by playing above board.
But the former group doesn't consider it acceptable, for various reasons. The biggest one to me is that I don't think the Democratic party can do a good job representing the people's interests when big money can preempt them. Or, to pick a blunt example, I think the left is fortunate that there wasn't a lot of money to be made by stopping gays from getting married.
The net result is that telling me how liberal Hillary really is doesn't move the needle for me. There's a second axis, it isn't just left vs right. It's also people vs money.