Completely agree that it isn't great soccer for most schools. If the only thing you are trying to get out of it is great soccer, you will likely be disappointed. However, my dd loves hss for reasons other than the actual soccer. Her school is a competitive D1 program, so the soccer is not awful but certainly not on the level of her ECNL team. Her hss coach is a former D1 college player and club coach, but the coach is clearly trying to develop the girls as people more than she is trying to develop them as soccer players. However, my dd loves hss for the social aspect of it as her group of friends and sense of community have grown by being on the hss team. I also think the less intense nature of hss provides her with a break from her club team that she appreciates. Overall, she is quite happy playing hss and is glad she doesn't have to skip it as DA would've required.
All that said, my dd has club teammates at other schools who hate hss. I think a lot of it has to do with the culture of hss program and/or coach. I am sorry your dd's aren't in a hss program that they are able to enjoy.