What do you mean by acceptable? That the opponent was not cheating? and did this legit? Or that this should be happening? Or something else?
It’s perfectly legit, I’ve had a score of 61 as Thorn, 20-0 with 21 assists, 58 with Benedict going 24-0 with 10 assists, 68 with El Dragón going 28-1 with 12 assists, 57 with 26-8 and 5 assists as Mellka, 63 with S&A as 27-5 and 9 assists, 58 with S&A as 26-0 with 6 assists, and many many more in the high 40s-low 50s that I did not screenshot.
It’s also expected for the game to be close, because in a blow out you don’t have the time to get so many kills. This often means that this player was carrying the team or something along those lines, or just was far superior in skill level