shutter island was a good movie. leo was great in that role
Yes. your are correct. love this movie highly recommend. Visually beautiful, wonderfully acted, and relentlessly gripping, Shutter Island is a brilliantly unrestrained psychological thriller that keeps its audience riveted throughout its entire duration.
martin scorsese is one of this generation's greatest directors
The ending of “Shutter Island” reveals that DiCaprio's character is a patient himself, committed to the Shutter Island facility after murdering his wife (Michelle Williams) because she went insane and killed their children.
critics thought it was not his best work, but that it was still good
Yes. You are correct. Martin Charles Scorsese is an American film director, producer, screenwriter, and actor. 
did you happen to see shutter island in theaters?
Yes. I saw shutter island in theater
i bet that was enjoyable. i only saw it once it was streaming
Yes. that was very enjoyable. best of luck to see shutter island in theater in future.