I really wasn't looking forward to this book, since the first one REALLY sucked, so I just bought it last week since I am obsessed with having every Warrior Cat book, no matter its rating. I was slightly startled to see that it was a bit better than I'd expected. Sure, it was, by far, nowhere close to a real Warrior book, but it had a kinda engaging plot line and left the reader with a bit of a cliffhanger, when she mentioned her kits being born. That's what I'm really looking forward to, seeing Hawkkit & Mothkit in Manga. Strangely, I read the summary of the next Sasha Manga and noticed that there will be a third kit called Tadpole. So maybe the books just go from dull, to okay, to good and it's going to get more interesting.
No, don't buy it, since it's honestly not worth 6 or 7 bucks for the slightly jacked-up drawings and small thickness, but you could borrow it from a friend or the library or buy it "for your Warrior Cat loving friend" and read it before giving it to them.
Hope this helped