I've owned this game on two different platforms so feel confident that everything you're about to read is going to be accurate as it relates to both my time on console (300 hours), and my time here.
First and foremost this recommendation is made purely out of bias regarding my love of the IP.
-This game is a microtransaction black hole, new jutsu release broken to push sales then get nerfed
-life without DLC purchases could be compared to hell, but at least in hell you occasionally would catch a break
-the community collectively has about 7.3 braincells resulting in matches where folks more or less throw because they're not playing to the game's mechanics or team centric meta (healers...go heal plz)
-the servers are absolute nightmares
-Cheaters run this game not the devs
-let's not even get into the scrolls or their drop rates, but suffice it to say you will empathize with the cheaters once you realize you can drop 100 esoteric scrolls and get not one featured item; the game gets to a level of grind that borders on nonsensical...no it is indeed nonsensical
-have I mentioned that the game has been out half a decade and no Kiba, no Shino, no ten ten. wtf???
suffice it to say that purchasing this game will result in a toxic relationship that you won't want to leave just because you get to create your own Ninja, pick jutsu, and really have some amazing fights once you learn what you're doing and you ignore the meta gamers. You will hate the vast majority of your playtime but even then there's amazing moments of socialization and teamwork on top of weeb actualization that will keep you playing each day hoping that it's a good one. Again, I'm not recommending this game bc I wholeheartedly believe it's good. I'm recommending it as a fan who's always wanted to put himself in the ninja world which I'm assuming is the reason you're here. Again, this game is a black hole that you will never leave, so do not expect to have warm feelings at least 5/7 days a week. Do not play this game thinking I'm lying and that you're going to have a different experience. each and every single NTBSS player is most likely a chain smoker after about hour 30; and especially during the ninja world hero festival. Do not get invested unless you're a Die hard Naruto fan who's emotions flair up everytime you see the swing; without that level of emotional investment to the IP you're going to have a rough time. Because it's our memories of the series and the connections we've made to our characters on top of our expression and builds that genuinely keeps us coming back every day.
There is probably the one thing that gives this game replay value into the 1000s, and that's the raw amount of build potential across the 4 classes of ninja. once you've gotten all the jutsu (DLC XD) you can occupy yourself for weeks just making builds and outfitting your ninja with the absurd amount of drip available in the game. one week I'm orochimaru's hidden black son, the next week I'm a fire spewing Uchiha, week after that I'm the healingest healer who ever healed this side of the healy river.
There, I feel I've warned you properly whilst simultaneously plugging the best parts of the game. Good luck whatever you decide. Just know that if you do purchase, make sure you warn your therapist.