As a Percy Jackson story, this is as good as it gets. Adventure, humour, a dash of danger with fun along the way!
I read this book after already starting Riordan's second series (I'm currently about to start The House of Hades) and man, the contrast... Even though this is but a snippet of a story, it is still so much better than the second series. Maybe it's because I just love Percy's on point sense of humour or Grover's still being the clumsy sidekick, but darn it. So much more appealing.

I started reading this out of a sense of completion. I want to read every PJ story there is, because I want a complete view of the world. But I have to say, it was much more entertaining than the second series, it made me really miss the OG PJ series.
Spoiler And that means a lot when there's a plot that's so light it makes your head spin and involves tricking an automaton into signing jeans while the main character is dangling trouserless from a billboard sign...
adventurous funny hopeful lighthearted fast-paced
Plot or Character Driven: A mix
Strong character development: Complicated
Loveable characters: Yes
Diverse cast of characters: Yes
Flaws of characters a main focus: No
adventurous funny informative lighthearted medium-paced
Plot or Character Driven: Plot
Strong character development: Yes
Loveable characters: Yes
Diverse cast of characters: Yes
Flaws of characters a main focus: Yes

4 Stars!

This made me laugh out loud, I liked the little flashbacks to scenes from the first five books, it was short and sweet. A cute, fast and fun read!
lighthearted fast-paced
Plot or Character Driven: Plot
Strong character development: No
Loveable characters: Yes
Diverse cast of characters: No
Flaws of characters a main focus: No

Percy and grover <3
adventurous funny lighthearted tense medium-paced
Plot or Character Driven: Plot
Strong character development: No
Loveable characters: Yes
Diverse cast of characters: Yes
Flaws of characters a main focus: No
adventurous fast-paced

It is a Percy Jackson short story. Felt a little pandering, but that's okay. 
adventurous funny lighthearted fast-paced
Plot or Character Driven: Plot
Strong character development: N/A
Loveable characters: Yes
Diverse cast of characters: Yes
Flaws of characters a main focus: N/A
adventurous fast-paced
Plot or Character Driven: A mix
Strong character development: No
Loveable characters: Yes
Diverse cast of characters: Yes
Flaws of characters a main focus: No