The only one that comes to mind is The Matrix. There are a good few sequels I really can't stand but ignoring them when I rewatch (or in some cases replay) the original is usually fine by me.
As has been already stated though, the way the first movie ends sorta begging for more and then the more being pretty bad makes me feel less inclined to watch the first.
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"Setsuna, you have to change. To make up for me... who didn't change." ~SCP~
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