First thing I must say, is that it ain't so good as Terminator 1 and 2, but what the hell is not that bad. Some people rated it as a "failiure", but we got to be honest, it had great points.
Two performances to notice is Anton Yelchin as Kyle Reese, and Sam Worthington as Marcus Wright. Heaven men, heaven, they made the film...
Christian Bale is great as John Connor, scary sometimes, but still great. I'm not so sure about Bryce Dallas Howard as Kate, but I can live with her. And the flick between Blair Williams, player by the gorgeous Moon Bloodgood, and Marcus is just right.
I could go on and on, talking about Terminator Salvation, but I will not do it. I can just say that it is worth watching, mostly because its funny seeing Kyle asking Marcus, what is music. Trust me, Trust James Cameron, buy the DVD and whatch it.