They're many bugs, some effect play, but many relate to the sub itself.
You could look at a mod like GFO and he should list the commom bug fixes.
I'm in the camp of using mods right away, why eat a hot dog when you can have steak. The graphic improvements alone are worth it. Just remember you'll have to relearn the game somewhat when you move to a supermod like TMO.
Most mods like TMO have a pdf file that you can download and read and compare changes.
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