I think Smokin' Aces was both serious when it absolutely needed to be and silly at the same time. A lot of people want their movies to be majority one and small heaping of the other and can't handle tone switches well.

Me, I loved how out there that movie got but man it gets genuine weight in some parts. I feel like that weight counters the insanity in a good way.

Smokin' Aces and Bullet Train is like that, tho' I think BT is a bit on the lighter side.