God, it's horrible as a single person. My roommate digs on me for what I eat (not superbly healthy, or, if healthy, in small portions) as well as for the fact I make multiple trips to the grocery (I get home at varying times, so don't always have time to cook and sometimes it's too late even to eat a crockpot meal), but also never wants to split and plan a menu for two to avoid costs.
I disagree that it's the solution, unless you can find a few meals that all require the same ingredients but are cooked differently. Otherwise you end up eating the same thing multiple times a week... Which just gets old. I'm fine eating dinner one night and leftovers for a day or two, but I don't wanna do it all week, even if you slightly change it up (mix grilled chicken in a salad, then a burrito, soup, etc)
Cooking for one is a bitch, and it sucks.