My take, the storyline made absolutely no sense. Both Skynet and the Resistance made idiotic decisions...it was like Dumb vs Dumber. And there were barely any Terminators in the film, even at "Skynet Central". A place where Skynet finally has the enemy it seeks...and sends a naked unarmed Terminator after him instead of every robot in the joint. Marcus has a chip which apparently controls him except it never does, it doesn't even control him enough to stop him from ripping it out. (It's apparently taped to the back of his head for some reason.) All just so he can defiantly rip it out. So dramatic! There's so much more, but who has the energy? 
Here's a good list of problems with it...
http://downfallofterminator.blogspot.com.au/2013/03/all-that-is-wrong-with-terminator.html
Some of it is pointlessly nitpicky, but there are many things listed that I agree with.

Here's a good list of problems with it...
http://downfallofterminator.blogspot.com.au/2013/03/all-that-is-wrong-with-terminator.html
Some of it is pointlessly nitpicky, but there are many things listed that I agree with.