I love the very first level of the title, after that it got very boring, very fast. It got dull and stail for me trying to collect 120 stars. I almost lost complete interest into the snow level where you slide with the penguins, but after that it lost interest once again. Great for exploring 3D titles on consoles with and really good for it's time, but a few months later there were much better titles. I will agree for a launch title it was good.
Getting all 120 stars was a bit of a chore, but I enjoyed the challenge. Also, you could beat the game with 60 stars, the extra 60 were a bonus for hardcores that couldn't get enough.