I've downloaded multiple CTR's such as Nightflight, Timberliner, and Dazemates Eurofighter. I've placed them into custom scenario parks and have found that guest are much more interested in riding coasters that we're pre-existing in the game. Is there a way to attract guest to ride the CTR's or is that just the way it's going to be? Most of the CTR custom coasters sit around 6-8 excitement and 4-7 intensity and low fear.

It may have something to do with where you've placed them in your park, try putting them near main paths to get higher density traffic to them.

the ai of the people in rct3 is bad, they tend to ride things near the front of the park and dont really make it to the back...