I always get a Swedish massage on our cruise. As others have said, some massages are good and some are great. You must also request if you prefer a male or female massage therapist when you make your reservation. I didn't get the scalp treatment on my last massage and missed that. It feels so good.
Also, on my last cruise, In January, slippers were missing in the lockers. I asked what happened to them and the therapist said people liked them so much they took them, so you might want to bring the slippers from your room.