It's got action. Fist fights, gun fights, fires and explosions, airstrikes and dog fights, car chases and crashes. The action never stops. Lots of tough guys with stubble looking tough. They even resurrect Arnold for a brief fight scene. I assume that was done by computer graphics.
The movie is set in the future were the human underground is warring against the shiny red eyed terminator machines of Skynet. The humans win in the end, at least partly. The closing voice over announced that the war wasn't won yet, leaving an opening for a sequel.
If it had been on TV I would have changed the channel.