Only you can decide whether you think you will get enough out of MM or not, but I will say that I got it last year, and thought it was great for us. But we did some meet and greets, which I had never done before, and would probably not have done if I didn't get MM, and it was fun. If you don't do the character meets, you would need to make it a point of stopping at most of the other photographers and ride the attractions that capture photos and or videos in order to get your money's worth. Since the photos are $14.95 a piece, you would need to have more than 12 photos that you would want in order to make it worth your while. I had about 250 photos, and 90% of them were great photos. I also liked that I didn't have to lug my big camera around with me.
Some people also will just ask the photopass photographers to take the photos with their personal phone or camera. I've never done that, so I cannot comment about it, but I guess it is an option.
Funny story, when I was booking my 2013 trip for me and my friend, I was going to get memory maker. She talked me out of it, saying it was too expensive (I was paying, but whatever) and she said we could just pass our cameras back and forth and each of us could take a photo of the other. Well, I had no idea that she was HORRIBLE at taking photos. So bad, that at HS, I asked her to take a photo of me in front of the NYC street and I was NOWHERE in the photo. She didn't just cut off my head or something, I wasn't in the photo at all! We laugh about it now, and it's a joke, but I was pretty mad when we came home and I didn't have any good photos of me from the trip. Needless to say, I got MM last year and I am doing it again this year.