His worst movie?

I want to nominate the cuts that Spielberg was responsible for in The Land Before Time.

Indiana Jones and the Kingdom of the Crystal Skull was the most disappointing but Hook was worse, I've never seen 1941 however.

The Lost World, for it’s overly long runtime, unlikable characters, collection of stupid moments, unbearably dark cinematography, and it’s contrived hamfisted environmental message.

Near contenders include The Terminal, 1941, Always, Hook, Ready Player One, and his entry in The Twilight Zone Movie.

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I haven't seen all of his movies, but Indiana Jones Kingdom of the Crystal Skull was a terrible film especially for his standards.

The BFG
The Post
Ready Player One
Indiana Jones Crystal Skull

KOTCS.

He’s getting to the point now where he’s made more bad films than good, but his worst is certainly Ready Player One. It’s absolutely unwatchable.