I loved RCT1, but never played the others.
I seem to recall that you had to play their preset tutorials, which were a lot of fun, but after I beat them all I wanted a big sandbox to build something from scratch.
"[Our former customers] are unable to find software which they WANT to play."
"The way to solve this problem lies in how to communicate what kind of games [they CAN play]."
Satoru Iwata, Nintendo President. Only slightly paraphrased.