Making a good sequel is a huge task in itself, and making the follow-up to arguably one of the greatest sequels ever, Terminator 2: Judgement Day, requires a helluva lot of extra juice from the director. Jonathan Mostow, however, seems to have thought that meant a few more cartons of Tropicana.
When human brain cells die, they don't regenerate. But having fewer brains than you did ten years ago may not make a whole lot of difference in figuring out what's going on. Basically, Arnie gets in, says about 25 words and kicks some major butt. But that's what you're there to see right? ....