Storm 3 definitely is my favorite so far, not only because some the best story events happen in it but also because they really outdid themselves in making the world feel better and just having better animations and cutscenes than in Storm2. I loved the sheer amount of side quest and extracurricular activities you can partake in, there's definitely a lot to do.
Having all the older battles part of the ninja timeline was very fun as well. I didn't at first prefer the switch to limited substitutions compared to the timing+chakra based subs in the previous games but I grew to like that mechanic a lot. Storm 3 was the game I played the most of the series way back when so relearning everything was pretty much muscle memory.
I hate though how there is no auto buying things from the collection so I had to manually buy each info card and such.
When it comes to difficulty, the game does have a few challenging battles but they are all pretty much easy S rank once you learn the ins and outs of each difficult battle. The final battle was a PAIN to replay because of all those flashback images kind of got annoying. I like the roster of characters and there are some cool costumes though most I do not prefer over the stock outfit. The HERO and LEGEND split was very fun to complete especially for the side quests that had it.
MY FAVORITE FIGHT IN THIS has to be the Uchiha brothers vs Kabuto, easily one of the best moments in the anime and they definitely did it justice. Also, I really like that all the Jinchuriki were playable! Would've loved to see more obscure characters in the roster but I know that Storm4 has those so I will see then. Obviously there is a lot missing from what was in the anime but that is to be expected, whatever was included was well executed.
I would say this is a 9/10 experience. I will remember it fondly.