If Kevin McCallister and John McClane had a lovechild, he would be David McHarbour. The comparisons are spot on, both literally being mentioned in the movie. It's hard these days to capture the right tone for an R-rated kinda family Christmas movie, but they somehow find a great balance of heart and guts. Instant cult classic, sure to come with lots of sequels.
Surprising and fun violence wrapped in a pretty present stuffed with a stupid story. Worth your time, but it won't become an adult holiday classic like Bad Santa or Die Hard.