The trackwork itself is pretty good. No rough transitions and I think it's quite enjoyable. My biggest problem with this track is that most elements are pretty wide or are pretty long (like the helices). Now the coaster is just nice but could be a lot better. With a name like "The Joker" I also would expect a track with fast and unpredictable transitions or elements.
The supports on most places look pretty good but the tall supports look a bit unstable. Some spots also look like they can use an extra support like the section just before the last helix.
The landscaping is done really good. The theming is a bit minimalistic but better than nothing!
When you push the emergency stop button as the train went over the lifthill, you'll get a stall because the brakes on the small launch / brake section in the middle of the track aren't strong enough. It's also not possible for me to get the train from the transfer track into the storage because that part of the track goes uphill and there aren't any transport wheels.
Its just a pretty enjoyable coaster. Nothing very special but I know for sure that I will enjoy riding it.