It was very good (IMO), not Disney-like but everything does not have to be. It had fantastic animation design. I found it to be very original in its design while playing homage to several different film genres. It was also very well acted by the voice cast. I would rank it below a Pixar effort but above other quality animated films such as "DISPICABLE ME".
A good time overall. Maybe not the best for a younger child, but the individual parent would have to be the ultimate judge. There is death, violence, and a "fear and loathing in las vegas" refrence. (not that the kids would pick up on that!)