Never beat it as a kid, finally 100%ed it when 3D all stars came out.
Honestly? If feels very rushed. Elements like Yoshi are hardly used, the final boss stage is short and finicky, the pachinko machine is 100% broken, and the blue coin collection is needlessly difficult and unrewarding.
I think when I first played it I was blown away by how good it looked, but playing as an adult, I’m more just disappointed in how messy and unrefined it can be at times.