Quick Thoughts:
Suprisingly enjoyable. I think the character development this season fixed a lot of their weaker points (Kuroko especially) and I liked most of the new additions as well.
Story:
This season can be split into 2 arcs: The Daihasei Festival and Indian Poker. It's mostly told from Misaka's perspective, but there are a few episodes where she takes a backseat to other characters like Kuroko or Saten. This works well in that allows dedicated development for important side characters while also given different perspectives on the main story. The pacing is good as well, I think first arc ended a bit abruptly but that's it. The ending was pretty typical; sort of SoL in feel and made sure to give every relevant character some screentime.
Art:
The animation quality seems about the same as previous seasons. There a few moments of awkward looking cgi, but it's solid overall. It looked like a lot of effort was put into the more climatic action scenes.
Character:
Many characters were introduced this season, and I think they did a good focusing on the more important/story-relevant ones. Misaka gets a good amount of development. We see her tone down her stubbornness a bit through some of the relationships she forms, comes to terms with her issues with the dark side a academy city, and the final arc helps display growth in maturity by drawing parallels with previous arcs. Side characters see some improvement as well. Kuroko for example is much less of nuisance/horndog (though that change isn't entirely her doing).
I think the characters I had the most issues with were some of the antagonists and Touma, to a lesser extent. Many antagonists had reasonable motives, but there were a few, like Gensei Kihara, who were too stereotypically villain, maniacal, and evil. For Touma, it may just be a lack context since I skipped Index, but he seems like a deus ex machina incarnate. I found his interactions with the rest of the cast were repetitive as well.
Enjoyment:
I found season 3 really enjoyable overall. It may be something I return to if and when I watch the Index series, just to see if I actually missed anything. If you liked the last 2 seasons I'd imagine you would enjoy this as well: less filler and more focused while still maintaining a good balance of action and comedy.
