Finished Son Of Neptune

I have finally finished The Son of Neptune. I was slightly disappointed at the end when all the characters from the whole Percy Jackson and the Heroes of Olympus series didn't meet together. Percy just puts his arms around Hazel and Frank and says: here are my friends, from Camp Half-Blood. I think the book had more dialogue than action which is fine by me, but some of the dialogue was pointless. Many of the characters lost their family and most of the time a kid went: "how's your family? My family is rich and well."
The other kid who lost their parents is like: "Oh, my mom and dad died when i was little."
Then he replies: "Oh I'm sorry."
And they don't talk anymore. They feel like they shouldn't be friends because he doesn't have parents. I think thats one of the reasons Hazel and Frank don't have many friends, because they both lost their families. I think when they came back from the quest successful, everyone wanted to be their friends.
Another thing is that the ending. In every Percy Jackson book i've read, the demigods always prevail and coplete the quest. I want a story when the heroes fail and the next book will be about how they resolve that failure. I hope that happens in the next book in the series: Mark of Athena.