Well if I was eating canned food more than I do at the moment I would be forced to pick out:

Canned Macaroni Cheese. I know it's not great but heated slowly in a saucepan instead of nuked in a microwave this stuff can be great.

Canned spaghetti bol. has to be Heinz.

baked beans, a damn good source of fiber and a staple part of most diets (try and get low salt ones though)

canned fruit salad, such good stuff.

Avoidances:

canned curry is never good
canned meatballs taste like the balls of a pig cut off and shoved directly in the can.
spam
more spam.