Blue Eyes White Dragon is a strong card,it's rare among finding in one of the Yu-Gi-Oh! card packs but not so rare if someone buys the Kaiba Starter/Structure Deck they give あなた a Blue Eyes White Dragon..so in a way yes and in a way no.
In the original series, yes and it is the strongest of all the original cards. But know that there are もっと見る than 1 series now, it's not the strongest among the other series editions.
