I like Princess. Really, I do. But I've never left a Princess cruise with a strong opinion one way or another, or with an indelible memory from the cruise. They do everything well, but nothing stands out to me. Perhaps I am looking too hard and not simply enjoying the cruise. The crew is nice and efficient. The food is good. The cabins are comfortable. The entertainment is perhaps the weakest point since it usually follows the staid old line of cruise revues and so forth.
Princess ships seem to be too cookie-cutter with no innovation. Of course the new Royal Princess looks to be interesting. I'll have to book it and see.