Stone Rabbit is the literary equivalent of a Saturday morning cartoon—loud, colorful, and designed to keep eyeballs moving. It's not going to win awards for emotional depth or teach your kid about perseverance, but it will get a 2nd grader who hates reading to actually finish a book.
The cartoonish violence is genuinely cartoonish (think Looney Tunes, not Marvel), and the robot-chaos premise is silly enough to be fun without being scary. That said, Common Sense Media is right: there's not much character development here. It's all action, all the time, with a quick-tempered rabbit protagonist who solves problems by... well, mostly by whacking things.
If you've got a reluctant reader who needs a win, this series delivers. If you're looking for something that'll spark deep conversations or emotional growth, keep looking. It's junk food—tasty, quick, and occasionally exactly what you need.