2008 doesn’t roar loudly for a Peugeot

When someone or something becomes successful, or merely really good, at what they do, any subsequent fall-off in performance or output becomes measured through a prism of revised order.
So, when, say, a rock band makes a classic record, after a series of duds, or a tech company comes up with a sensational new piece of kit, having been stuck in a rut, everything else they do subsequently is measured against that single achievement and not the dross that went beforehand.