Jurassic park and The Lost world was directed by Spielberg, however Jurassic Park III was not.
Spielberg has directed some amazing Films, including historical based Saving Private Ryan, Schindler's List and Munich.
ET, Close encounters and War of the Worlds were also really alien movies directed by Spielberg. The first two have far more meaining to them then the last which is a big action alien movie.
Even Minority Report (also directed by spielberg) was nothing but an action movie still managed to have strong social and ethical questions attached to it.
AI lacked what Spielberg is good at, but the movie is by no means at all terrible. One of the Greatest directors ever basicly created the story. Some people I think expected something different out of it, but you have to be a complete idiot not to fully examine and comprehend the true meaning of the Movie. Stanley Kubrick by all means was a genious.
Other notable collaborations are Raiders of the Lost Arc, and The Last Crusade (with George Lucas) and is also noted as being incredibly good movies.
Finaly the greatest actor ever has appeared in Spielberg's Empire of the Sun. You might know him as Batman, but Christian Bale played a great part in that film, and it should be noted that the movie was really good.
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