The problem is that it's grossly inefficient time-wise, and the content of "conversations" was always very, very simple. "Hi my name is _, I like the color _, My hometown is in _, how are you today?" Is not a real conversation. It's boring and most students learn the vocab for the upcoming chapter's test, then forget it after.
I'll concede that with 3 semesters of German, were I to pick it up again, I would probably do so pretty quickly given that the teachers paid a lot of attention to our essays.
It's probable that small classes would help because the teacher could then be more of a private tutor. But with 20-30 size classes, only really motivated students who already study/watch media outside of school will excel. So it's kind of redundant in my opinion.
Diligent self-study with attending a language exchange or another environment to speak/practice the language will yield much greater results much faster. You can study the same textbooks at your own pace, you can find additional material and study groups, and you can hire a tutor at times to fill in gaps.
I think if you're a college student it's fine since you have to pick a class anyway (I had to take 3 semesters of any language), but as an adult where time is significantly more precious, I can't recommend it. In a sibling comment I went over what I do use.