I am a big Terminator fan and if I hadn't bought it already I probably would rethink it.
Its really short and really easy. It does cover the movie but far shorter than the movie itself. Its a typical 10 bucks game. The only thing left for me is the execute option with Sarah, and finish the boss rush (which is kind of cool). But replaying it means also replaying placing bombs, escaping the hospital, doing the quite limited but very cool OST laden belt action bar brawl. And the branch out stages aren't that special so far (there is more T800 gameplay though).
The game feels a lot like those movie licensed Super Nintendo/Genesis games, with the same length to match but far easier. It reminds me of Jurassic Park: Rampage.