Is this the worst Christmas movie ever?
Hard to think of a worse one. It's tedious, dull, and not worth being named after the classic Christmas Carol film or its character.
I think the main problem is that there is no motivation. It's modernism, which means one dimensional characters with zero motivation, just doing what is in a script. Nothing is credible, and it's impossible to give a hoot. The original Ebenezer Scrooge was credibly motivated throughout the short story and each film. There is nothing even remotely motivated about any lead character here.
On the good side, it isn't overly depressing, so I give it 2/10, which I agree is generous, but it still is the worst Christmas movie ever, making the Santa Claus Martian movie look good in comparison, and that's a 3/10 movie.
Nothing against the actors. I agree with you all that it is the script that is pathetic here, and it can't be salvaged, and shouldn't be salvaged.
Now go away or I shall taunt you a second time!