My first exposure to Astro City happens to be the last volume. I saw this at the library and picked it up. From my understanding, the series is more of vignettes of people and superheroes living in the town and isn't really a cohesive story. 

This was a fun and surprisingly emotional collection of three stories dealing with loss in a superhero city. The first is about G-Dog- a man and his dog who, because of an amulet, combine bodies and become a superhero.  The second is about a daughter trying to find her dad. The last is about a man who runs a support group for people who've lost loved ones due to superheroes. All of these stories deal with various aspects of loss and moving on. They are poignant and well written. 

The art reminded me of the Watchmen or earlier superhero comics. Having that hyper stylized feel to stories with depth gave the script room to breathe. 

Overall, I would recommend. I look forward to reading more.