Not really, it's just that they're lesser known outside of their 3 big hits. My parents know who they are they just didn't hear them much on the radio during their primetime outside of their few big hits. That and the Christopher Walken SNL skit (My mom recognizes it under it's ever-so-famous moniker of the "More Cowbell song")
I saw Blue Oyster Cult at a strange venue. In the mid 80s, I saw them at Six Flags Atlantis (a water park in Hollywood Florida). I went with a couple of friends and we paid admission to the park during the day and we stayed for the concert that night for the price of admission to the park. It was a fantastic show but it just seemed a really strange place to see a band that was as popular as they were at a place like that. It was fun though, water slides and BOC. This was probably around Club Ninja time.