I'd ask this question of myself, but I can't think of any series where this would apply to me.

I may have thought of one: Street Fighter. I've never played Street Fighter 1, but by most accounts it's horrible.

I can think of a few reasons this might be an exception. For one, while Street Fighter 2 inventing fighting games as we now know them, fighting games did exist before... and did, in fact, exist even before Street Fighter 1 (such as Yie Ar Kung Fu). Thus, even if you value the progression of games and game ideas, you don't necessarily have to give much, if any credit, to Street Fighter 1.

I LOOOOOOVE Flying Omelette!!
Crawl and 1000