Surprisingly enjoyable to watch as an adult. It's new and cool while still having familiar faces. I liked how the actual story growth focused on one character instead of trying to shove too much into 1.5 hours. My 3.5 year old son loved it and it kept his attention, as well as the other kids in the theater.
You can tell that part of the point of the movie is to sell more toys and merchandise, but they've gotta pay for their new vehicles somehow! Also, I liked how they showcased every pup in some way because they know that every one is someone's favorite.