Universal is Universal, always cool!
There are no traditional roller coasters in this park, they are all 3D/4D experiences.
We took the fast pass, but at the time we went we didn't even need it and the "single ride" line works well too. But if you don't want to wait anything, it's worth buying. That was our case, we enjoyed it a lot.
Mario park is the most crowded part, we went there in the afternoon. They don't check that you have entered more than once, you can go and come back. Toad's restaurant needs to reserve a time, it is very crowded and we had to wait a long time, so make a reservation when you arrive at the park.
Mario's part has the longest waiting list, but as I said the "single ride" part works really well.
The toys are the same as in Orlando, just the Mario part is different.