Black Flag murders Minor Threat (who I dislike) as well as Circle Jerks (who I do like). I don't really rank Black Flag with the whole DC hardcore scene, even if Rollins came from that area. Black Flag, for me, drew the blue print for what would become hardcore...but didn't just stop there. They went on to explore several different approaches to music. Much more experimental than what most punk rock fans are typically willing to give them credit for (but then again, many punk fans, and especially hardcore fans, tend not to embrace experimental approaches to music).
Black Flag are one of my favorite bands.
Also, once upon a time I did like Minor Threat. I think they are a good band for the kids. I just can't get into Ian any more.
Shit, if it hadn't been for "My War" era Flag, who knows what the Melvins would have went on to do.