I saw it last night. I loved the terrific special effects. Definitely a guy movie (Though that shouldn't stop any female Terminator fans). It was smart to make a movie about mostly indestructable robots that look like humans who fight each other, because since their mostly indestructable, anything goes and its HIGHLY entertaining to watch. T3 is certainly not a let-down in that aspect. I do think that something was missing from the story. It seemed sort of short.
The ending was a bit depressing, as they didn't stop Judgement Day, but it was still good. That is, if there is a T4, then we are pretty much guarenteed of the future world, but if there is no sequel, then the ending TOTALLY sucked. I'm pretty much banking on a fourth film.