If you’re like me, you’ve been waiting a long time for the fifth “Terminator” film, which opens in theatres nationwide this Friday. Despite some pronounced fan outcry in response to alleged reconstruction of the franchise’s overall narrative and a lukewarm advance buzz (excluding, of course, the endorsement from original director James Cameron), there ARE those of us who will buy a ticket on opening day because hey, it might… actually… be good? It’s been a while since the “Terminator” franchise has genuinely rocked our world: Jonathan Mostow’s so-so third film, “Terminator 3: Rise of the Machines,” has a pretty killer ending but is otherwise more serviceable then awesome. And of course, the less time spent talking about McG’s misbegotten “Terminator Salvation,” the better. But before us “Terminator” nerds get all worked up about this new installment, maybe it’s time we all took a look back at the films that...