TOD:
I think "The Godfather II" is a masterpiece. Not as wild about the original.
My favorite Indiana Jones sequel is the third in the series: "Indiana Jones and the Last Crusade".
At their time of release, I fully enjoyed the sequels to the original "Planet of the Apes" film, especially the one where the apes went back in time and surprised human earth.
There were two sequels to "Star Trek: The Motion Picture" I thought were splendid: "The Wrath of Khan" and "The Voyage Home".
And, while they weren't as brilliant as the original "The Thin Man", I thoroughly enjoy the five sequels!!!