Ready Player One was hands down one of the best books I've ever read, it kept me so engaged and forced me to binge-read it to the very end. Coming off of that I thought Ernest Cline would do the same again, but unfortunately, that's not the case.
But that doesn't make Armada a bad book, but it doesn't make it the successor we all want from Ernest Cline. The story starts off slow and builds over time to what seems to be a somewhat rushed end in my opinion. The book tells a story of a gamer, a world class gamer who also is a school boy. It dices with social awkwardness of being the outsider that no one understands and then throws it into a lion's den of sci-fi to add some varying elements.
The premise of the story (not to give anything away) is actually somewhat believable to a point and is something you can envision to be a reality in 10 - 20 years time and highlights how brutal humans are to one another and that any alien existence who look down on us probably doesn't paint them a warm and inviting picture.
*Slow Beginning, Intriguing and exciting middle and a rushed end. This book is probably a great read if it's your first Ernest Cline book but if you've read "Ready Player One" you will be somewhat disappointed with this book.