Does anyone here dislike sleeping on a high quality memory foam mattress topper?

I have only heard raves about them. They keep you cool; they conform to your body; they are so comfortable; you sleep better; etc. I bought a 3 inch topper and placed it on my bed after letting it expand and air out on another bed for about 2 weeks. I put the zippered sheet over it and put my usual mattress pad on top of it to hold everything together.
This is the third night and I don’t like it at all. It feels great when I lie on my back. But, for everything else it is not comfortable. Rolling over is a chore. When I lie on my stomach I feel like I am suffocating.
Am I the only one who does not like this new invention? Does anyone have suggestions? Do I need different sheets? Should I put a board under it? I am willing to experiment.