Coffin Rock is a great entry point for marshals and players into the Deadlands setting. The module is quite well contained and doesn't have you diving headfirst into a sea of Deadlands canon, so you have the opportunity to focus on theme and the town's (Coffin Rock's) individual NPCs and locales. There are of course connections to wider events, but you won't miss out if you happen to forget them during games play. This is the first official adventure for Deadlands Reloaded, and was probably designed as such.
The small town is detailed down to the dwelling, with various events corresponding to the various fear levels for each dwelling noted, along with the town's immediate surroundings. This design gives a large variability on the amount of play you can get out of this 30+ page product, and will work if you want a really quick two session adventure or a mini-campaign. As for the plot, there's nothing trying to be clever, but it won't feel dog-eared cliche either. If your posse succeeds they'll be able to pat themselves on the back and have something to show for it in the papers.
My one gripe is a technical one. Many official products have PDF layering, where you can disable images, txt etc at your own discretion. However this product unfortunately does not support that feature. I like to print and markup documents, and this saves on ink and writing space.