Are you familiar with Monster? Both this and Pluto are anime adaptations based on the same author's work.
Pluto felt like a distilled version of Monster in the way that it built its mystery up over only 8 episodes rather than 74. The beginning part of Pluto did a good job of evoking that same feeling of tension and fascination that made Monster so enjoyable to me.
There were times during Pluto where the dialogue felt obnoxiously obvious, clearly providing exposition that the audience didn't really need. These moments pulled me out of the show a bit. Off the top of my head as one example: in one scene there is an explosion, there is a 0.5-1s pause, then one of the characters says, "It's an explosion!" Thanks, script writer, much halp, very explain.
Though even despite those moments, and also even despite its kind of unbelievable concept of robots exploring emotions, Pluto did a good job of pulling me in and I was able to suspend my disbelief for most of the series.
I liked it more than I disliked it. Would recommend it to any fans of this author or people who are interested in sci-fi murder mysteries.