Well it surely is not as bad as people describe. For those who give one star, try the Atlantis Submarine in Maui. Talking about getting bored and ripped off for 2 hours!
This is a truly working steam train (using oil instead of coal). Clean and neat. Very hard to find in East Coast as many alleged steam train rides in that region are actually pulled/pushed by diesel engines.
From Lahaina, you'd see the real turn-table in action. The train is open air w/ roof, with live music. The scenery is decent except the part near Lahaina (back of parking lots et al).
On the return trip, you'd be able to see the train getting water from a water tower (imagine Thomas & Friends in real life!), plus a big steam woosh on a wooden bridge. It's pretty cool. Again, live music on the return trip.
My tip is to get some shave ice and enjoy the train in the afternoon (when it is more windy and thus making the ride a little cooler).