Undoubtedly better than any Terminator movie that came afterwards.
This movie may not be perfect and not as good as the first two Terminator films,, but it is a fun watch (maybe as a guilty pleasure).
The acting ist good. Christian Bale as John Connor is as best as it gets. Sam Worthington does, as always, a decent Job as the lead character.
I liked the production desing. One could wish that it should have gone in that or this direction, but overall they did a good job.
The cameo of Arnie as a CGI-character and a fresh T800 was enjoable and fun.
People gave it a lot of flaming back in the days - but, hey - it's at least as good as the 3rd movie and it's definitely better than anything that came afterwards, at least regarding story and characters.