"The critical flaw with Mint is that it makes the procedure of entering bank login information part of the routine.
If someone logs in to Mint and the system says "Problem
Connecting, please re-add your account" a user will not think twice about re-entering their username and password because Mint keeps telling them that's the solution to the problem.
Mint is doing the WORST thing possible: creating a situation where users become complacent and reflexive about re-entering bank and credit card login information."
verticalairship commented on Mint.com Responds To Security Concerns
http://consumerist.com/314231/