We have separate mint accounts, but mine is the important one - his is only used to track his own personal income and net worth.
Our credit cards are all joint, and we do 99% of our spending on those. I manually add in the one or two cash transactions a month. I keep all our spending correctly categorized and tracked, so the majority of "the big picture" is found on my account, and I just ask him what his net worth is sitting at if I need the number for some calculation.