Came here to say the same. Pimsleur is also excellent for pronunciation and I have this feeling that once I learned something from the course, I never forget it. It just sticks, even after months or years. It is also most similar to how babies learn - without grammar, reading and writing, just by dialogue.
Yes, Pimsleur gives you excellent pronounciation and the sentences really stick (which is very good, of course!).
But apart from that? It doesn't teach you grammar, so you are repeating and repeating like a parrot, hoping that one day you will know why they say XY in one sentence and YX in another sentence. It's true that babies don't learn formal grammar, but they usually grow up in an environment with full immersion (several hours per day over several years), surrounded by native adults who give their best to interprete, repeat and correct (!) their utterances.
In addition, Pimsleur is very slow but it gives you the illusion that you are learning a lot by keeping you constantly busy. At the end, how many words do you learn in three levels? 400? That's barely A1! Most annoying, 70% (just a guess) of the time, you are just listening to the English speaker ("Now repeat this", "Try to say that",...).
