I'd give it a 3. I's probably closer to a 5 objectively, but the fact that for a few weeks we had the sheer excitement of knowing we were getting the first ever ABBA CHRISTMAS SONG OMG only for it to be far less than the sum of its parts and potential, remains deeply distressing to me.
ABBA and Christmas are two of the best things ever - it should have been so much more. I was fully prepared for it to be a ballad (something misery tinged like Happy New year or basically all their other ballads would have suited me beautifully), but old people getting gently horny as a children's choir sings? Absolutely not. No thank you.