i agree with jr: how is this 'formula' a bad thing? indeed, i don't even see how it's a 'formula' at all. a formula, say, for fantasy would be having your halfling type hero (invariably unsuited and unprepared for any kind of heroics) whisked away by a wizard, thrust into a ragtag band of misfits, some of whom don't get along, going on a trek through dangerous territory while being pursued by the great evil's terrible minions, and having the halfling save the day in the end. somewhere there's a big battle and a few of the characters will likely die. *that's* a formula, lol.
i would, however, like to amend the 'likeable' part to include just 'interesting' if that's all you've got in a character. no one wants to read about a mary sue any more than they want to read about a vampire with a moral objection to drinking human blood (oops, sorry, i probably stepped on some toes there).