Id argue thats worse for the person. Their goal is to learn self defense, they are settling on a school they're happy with and isn't really teaching them self defense. For a more apt comparison, it would be like recommending OP go to a swim school-itll build his muscles up a bit, and if he's ever attacked in the water he's golden, but overall it's not much help. The school's that claim they teach 5% self defense, but don't actually focus on that part of it, aren't much better.You're assuming that just because a martial art doesn't focus on self defense, that you can't learn it. That is horribly untrue.
If you go to a class for two years and even only 5% of it is self defense, that's more than if you burned out in a month on a self defense class that you hate.