If we're -really- going to do this according to so-called "universal acclaim" (and we really shouldn't, since many classics are controversial by nature), then the only games that really come close to being "untouchable" are the Super Mario Galaxy twins, and I suppose Demon's Souls and Dark Souls (though Demon's, at least, is quite easy to criticize, starting with the rough-shod visuals, for one...). Red Dead Redemption comes close; it's one of the true "epics" this gen, in that by its conclusion you feel like you've finished a novel that could sit comfortably on a book shelf with the literary classics. The Wild West of RDR is just that fully realized, and there are strong enough themes to carry it through a rather middling middle section (Mexico).