Dangerous Angels is an omnibus of the first five Weetzie Bat books. I read it straight through as though it were one long book, and I liked it.
Even as an omnibus of five books, Dangerous Angels isn't much longer than Divergent, and may even be shorter than Harry Potter and the Deathly Hallows. Definitely a doable read.
I've already reviewed the five books separately. I liked them for the most part. Some more than others, but none of them were bad.
I think this series really works well as an omnibus. It flows well, and when you read all five books in a row you get a lot more overall character depth and growth.
*I checked out my copy of Dangerous Angels from my public library.