When you go to a semi spa, go in with the expectation that you will get a good massage and minimal service. This is your baseline and anything you get above that is gravy. Of course, mileage can go up with repeat visits.
I'm assuming you've been to Just Relax before...they are very busy, most customers go there for a good massage and basic HE. This is all that a lot of customers want, they are not looking for higher level services.
If you go to a semi place, see a girl for the first time and expect BJ or FS, more times than not you will be disappointed. If you want those things, then go to the spas that provide those services to everyone, then you don't have to play Russian roulette.
Btw, the YMMV "crap" is actually one of the best reasons to go to a semi place...if you are fortunate enough to get the extra mileage, it's often because the MPA wants to do that with you...the end result is that it feels much better than the transactional feeling at holistic spas.