I worked with my PT because, given half a chance, I'm a complete sloth. Walking is the only exercise I like (as is swimming, but that was out), but walking isn't all that fun, or even possible, right after surgery. So I worked with PT. But when my therapist wanted to get aggressive, I put on the brakes. My body. My knees. If I didn't want to "pull the strap until you scream" I didn't pull the strap. I didn't let him push on my leg to "see how far it will go." I said I'd do it myself or it wasn't happening. If I liked an exercise, or it didn't hurt, or I thought it really helpful, though... those I did with enthusiasm.
I saw more improvement BETWEEN my therapy sessions. My knees would be less stiff. I walked better and with less pain. Since quitting PT, with my surgeon's blessing, several weeks ago, I've improved more rapidly. I ice and elevate three or four times a day still. For exercise, I walk a few miles a day, part of that through daily activities and the rest through strolls around my neighborhood. I walk up and down stairs, holding the rail, easily.
Do I think PT hurt me? Not at all, and some of the exercises for balance really were helpful in building my confidence. But I never let the therapist push me and I never did any exercises at home, except some walking, using those days to rest and heal my new joints. To the extent that you can "customize" your PT experience, I think you will find that a good path to success.