My understanding is that different therapists can be of really different quality - so you might need to hunt around for one that is good and works for your personality.
In the end though, worst case scenario is you maybe waste some time and maybe money (although hopefully not much money if you have insurance). An hour a week is not much time to spend if it works, and if it doesn't seem to be working you can always just quit or try a different therapist.
I agree, and would like to add that therapy isn't necessarily a constant thing. Short- and medium-term therapy focuses on a specific issue or life event, and when one feels like they've gotten a handle on it, they don't need to continue sessions. So the fact that people discontinue therapy is not, in and of itself, a bad thing.
In the end though, worst case scenario is you maybe waste some time and maybe money (although hopefully not much money if you have insurance). An hour a week is not much time to spend if it works, and if it doesn't seem to be working you can always just quit or try a different therapist.