Where Days of Future Past stumbles is ambition. The film juggles many threads—political paranoia, personal guilt, mutant persecution, and time-policing—so certain characters and subplots feel thinly sketched. Fans might quibble over which arcs deserved more breathing room, but the trade-off is a propulsive screenplay that rarely lags. The stakes are clearly drawn: change the past or doom the future. That clarity helps the film’s dense ideas stay comprehensible during high-octane set-pieces.