While I like the film, I don't think it's really worth preserving, as it doesn't really add anything to Terminator 1 except for a few plot points that make it more entertaining, and even that is just my opinion.  There's also the issue of how a theme of Terminator 1 was that the past can't be changed, which was undone in this movie (and then redone in 3, but that's irrelevant).  What do you think of the whole 'can vs can't change the timeline' thing in sci-fi?