Feature-length film comedy is harder to pull off than the episodic sitcom - it doesn't have the same factory machinery up and running, teams of writers putting familiar characters through permutations - but that doesn't explain the widening quality gap that makes movie humor look like a genetic defective.
The days when the words 'Hollywood actor' framed Ronald Reagan like bunny fingers as an ID tag and an implied insult seem far-off and quaint: nearly everybody in politics - candidate, consultant, pundit, and Tea Party crowd extra alike - is an actor now, a shameless ham in a hoked-up reality series that never stops.
Bad acting comes in many bags, various odors. It can be performed by cardboard refugees from an Ed Wood movie, reciting their dialogue off an eye chart, or by hopped-up pros looking to punch a hole through the fourth wall from pure ballistic force of personality, like Joe Pesci in a bad mood. I can respect bad acting that owns its own style.