I finished this DLC yesterday and I honestly say I got some pleasure on it!
I'm not sure the DLC worth its actual price but it introduce new good looking environnements, a crazy stupid storyline(in the good sense, especially compared to EDT), new funny activities and clothing contents.
The story has entertaining cutscenes(2 in total, the opening and the ending) that sometimes get heartwarming despite it's insane cheesiness. The humor is definitely better than the penis joking ETD.
The Saints crew doesn't appear much overall though.
The environnements are a welcome change and the collectibles may justify to replay the campaing.
The new activities are mostly funny, not for long but entertaining enough. The new Genki activities may be annoying sometimes, especially in the hardest difficulty but I completed it in 4 attempts, not a big deal.
The clothings, weapons and vehicules aren't memorable but they fit the mood of the DLC.
This How the Saints Saved Christmas is definitely a little amusing gift that made me forget about the ETD coal I got earlier this year.