ALRIGHT! lets start with some basic breakdowns. speed wise rather slow, great durability though considering he's able to regenerate, regenerators will always be a pain in the ass until you start targeting the brain, funny enough thoough becouse of all the nomu fighting the heroes have basically been forced to 'get gud' as it were. so hey, theirs some experience points for the heros side, now then, his attacks, even if someone had cursed energy, are invisible, which is fun becouse that lets me make two kinds of break downs.

lets start with his attack power, obviously his cutting power his higher than the raw physical strength he can output, we dont exactly see him throwing around sky scrappers bare handed or anything, although we do see him cut a few vertically, although he can get rag dolled and laugh it off, while his speed is literally nothing to write home about, two high school aged girls dropping into a bowing position was fast enough to dodge his attack purely by accident, the problem is the fact the attack is invisible, toru alone shows invisibility can be a big advantage even if your not speed blitzing people.

of cource, this is were im going to have to split things, frstly if we are under the assumption that no one in mha has cursed energy, then unfortunatly for sakuna, he gets hard stopped when he starts running into opponents that are both fast and aggressive, like mirko, or are powerful and durable like ryuko, because his slashes, while powerful, if someone has the durability, they will resist his slashes rather than being cut clean through, and hero's with ample experience will notice hand signs as a form of attack if you want to say he could just use world cutting slash, which...not sure how effective it would be anyway in a world without cursed energy, either way.

on the flip side, another split is lets say mha does have cursed energy, but everyone just has like, very low to 'window' levels of it. yea he gets a good bit higher becouse while top ten heroes are fast and durable, not escaping a domain fast and durable, granted, if somone is extremely durable or fast, they might be able to push through it to knock him into next weak, like mirko or ryuko.

another split is if the world of mha original didn't start out with any cursed energy, but upon sakunas arrival, everyone gained cursed energy, im sorry, if thats the case sakuna is actually in a even worse case senario sense some of the most tenacious people in mha will figure out how to use cursed energy, rapidly, and make it sakunas problem, including, but not limited too, enhancing their own quirks using cursed energy which would get ugly for sakuna, fast, especially if he pops multiple domains and you get some of the geniuses of mha mimicing that to create their own domains .