My dad has these old games somewhere in the basement. I used to play them often, and they are really fun. The main problem is that Roller Coaster Tycoon 1 allows you to get profit from park admission, rides, and food & drink, but there is no option to create your own park challenge. Roller Coaster Tycoon 2 lets you make your own park challenges, but you can only get profit from admission or rides and shops.
Overall, each game gets a 9/10.
My dad built Vortex and The Beast roller coasters from the King's Island park in Roller Coaster Tycoon 2.