While the climbing is great, it is a very short route with basically 10 or 15 feet of real climbing. I would not really say worthy of the four stars the guide gives it. Definitely fun and well protected though.
Note that if you rap off the single bolt up top you will not make it to the ground with a 60m - you end up having to rap off the end and dropping a couple feet. It works, but be prepared.
This climb is featured in a video that I created for one of my film classes. For the video we approached via the North Wonderland trail - much longer but more scenic than the Rattlesnake Canyon approach. The video can be seen here
The Slatanic Area has superb positioning up on a ridge, making for a very photogenic climb. Great rock and cool moves on the arete and face, but as Graham said it's got a short crux with a lot of easier climbing. If you're in the area you might also consider scrambling on over to the opposite side of Valley of the Kings and climbing the Firewater Chimney, another 5.10b, and one of the best in the park.
I thought the fall potential was bad on the arete/face section before the crack at the top. I wouldn't recommend this to the budding 5.10 leader but then again, that could be said about a lot of routes in the park.
Rock quality, position, movement, variety = 4 stars in my book. After leaving the crack at the start, there is a committing mantle move out onto the exposed arÍte to clip the first bolt. It's not too hard, but you will not want to mess it up.