As to the Shaggs, as I posted earlier in the thread, I'm amazed that they're able to recreate Foot Foot 40 years later. Especially the drum part. A reviewer said many moons ago something to the effect, "The drummer is frantically trying to keep the beat to a song her sisters aren't playing."
Frank Zappa thought the Shaggs were great. Just based on his recommendation, I've listened to their album several times. It has its charms, but I've gotten no further liking their music than I did trying to develop a taste for wine one year.
Here's another act I'd put in the same bucket as them. I first came across Daniel Johnston as a result of Tom Waits being a fan. I think I like the Shaggs more, but YMMV.