All true. But if you get in early enough, you can create a Christmas tradition. "Grandma Got Run Over By a Reindeer" was awful, but it's part of the canon now.
And if an actor's a big enough idiot -- like Will Ferrell is -- people will respond. Part of the appeal is laughing at just how much of an moron Will or the character he hides behind is.
And there's a very steep slope between good and bad Christmas movies. You can get a queasy feeling watching some that aren't as bad as Elf -- Jingle All the Way, Deck the Halls, Bad Santa, Fred Claus, Surviving Christmas.
If I take three Will Ferrell movies two are awful & one is reasonably funny. A great comedic movie I can watch & watch, for example Will Ferrell’s “Talladega Nights” once was enough. It was funny once.