Zufari is a good effort but I agree that it could of been a lot better, a longer route for a start, take the trucks all the way up past the viewing platform in Wanyama, I don't care if you can see the trucks from the Wanyama area but the opportunity to see some of the animals from on and off the ride is good. The animal houses do feel a bit too close to the current truck route, but if the route was longer you wouldn't notice this as much (plus get to see more animals!).
If theyare going to do the cave finale they need to make sure it works 100% of the time, or have a back-up narration and route that by-passes it. When it works its not a bad ending.
Same goes for the pre-show, the reason it often fails is that British people aren't into audience participation as much as in the US, so unless Gozi works well and tries hard, people aren't interested and then if the character gives up trying then the audience are even less likely to play along.
I had a great trip on Zufari on a weekday when there was no queue, the truck parked up and we took a very slow trip, with an extended narration to match (compared to a busy day with a full queue). What let it down on the quieter day was that Gozi didn't seem to even try to give an interactive pre-show and only the sound was working in the cave, this is when a by-pass was probably needed! But on those busier days the cave adds extra capacity as can fit more trucks onto the track.