Building a deck is all about context. Sure, some cards will be weak in any context, but even well thought-out decks will fail if the other decks in the metagame aren’t considered in the process. Even within a format certain decks can thrive in a certain meta and falter if moved to another environment. Just look at Frank Karsten’s article on the worst Pro Tour winning decks. Some of those are unthinkable today due to changes in card quality, but they weren’t that good in their day either. They just happened to be just the right deck for that particular tournament.