'Smash and Grab' did sound very cute, which is in no way a bad thing for Pixar. Pixar actually does cute very well, as when they do it it's adorable and affecting and doesn't become over-sentimentalised. There was the worry that it would be too simple, as it is not something that sounds particularly original or complex. Pixar though are one of the best animation companies to exist and have made few misfires but there was definitely hope.
Am not going to say that 'Smash and Grab' is one of Pixar's best, because it isn't. Of the recently seen Pixar short films, it is one of the weaker ones (only because the best of them are so brilliant) and the previous short films watched before this one ('Out', 'Loop' and 'Wind') had more depth and emotional impact (especially 'Loop'). 'Smash and Grab' is still a very pleasant watch and is very good in quality. It just didn't quite wow me.
It is formulaic and very slight, so there is an over-stretched feel occasionally and not much to be surprised by.
Other Pixar shorts have more complexity and emotional range.
Despite how that sounds, there are many fine things about 'Smash and Grab'. As to be expected with Pixar and nearly always lived up to (the character designs in 'The Good Dinosaur' being the exception), the animation is beautifully done. Particularly the atmospheric colours and sweeping exterior shots. Not to mention the rich attention to background detail. The music fits ideally and pleasant to listen to, the standout part being "Showdown Robot Bromance".
The story is not a special one, but it is very charming and while the poignancy is a lot stronger in other Pixar shorts the heart is definitely there to genuinely endearing effect. Also absolutely loved the message, a true to life and important one done with delicacy instead of being sledge-hammer like. The gentle humour amuses.
Not to mention the characters, they are so cute and 'Smash and Grab' does so well at allowing one to effortlessly root for them, feel empathy for them and make them likeable. Their chemistry is very sweet. Even though wordless, the characters and their chemistry tell so much anyway still.
Concluding, very good if not quite top-tier Pixar. 8/10.