I'm the opposite, I've played only the multiplayer of Call of Duty. It's remarkable only in its feature set, everything else, from the maps to the weapons, are mostly uninteresting in design and/or bland.
I'm too young to have experienced McDonald's fries back when they cooked them in lard, so I have no idea if they were ever actually good. I just know I'd rather take the time to fry up my own batch, because they're much more tasty.
The fact that CocaCola tastes good only when something else is added to it speaks of its blandness. I do like Vanilla Coke, but it's only because of the vanilla, and vanilla creme soda is much better.
I guess blandness sells. It does have the widest appeal, after all.