Besides the advertising that chc points out the thing that made me most uneasy was the lack of running balances.
A few years ago several credit card companies removed running totals from their online transaction histories, more recently they removed them from monthly statements also. It turns out that without a running balance customers are more confused about what is going on with their accounts and spend more money and don't notice certain fees. Running balances have been standard for decades and then the banks figured out they could screw people over by removing them.
When I noticed that Mint does not do running balances even though it is one of their most requested features [1] I knew who their loyalty lies with, they've proven that they'll make the user experience worse in order to please the banks. If Mint is not going to help me understand my money better then what's the point?
OK, I'm going to expose my ignorance here, but what do you mean by "running balance"? My understanding of the term is that it's roughly equivalent to "current balance" which Mint does indeed give. I've never been hit with fees due to any misinformation on Mint's part.
