Relevant.
I suppose. But then, I could take virtually any movie or series and point out stupid things in them.
1.) Initially, the time paradox is the point of the first movie. Later, they decide they want to create multiple timelines and crap, which actually does a better job of explaining things, but in a less fun way.
2.) The author of this article seems to forget (not know?) that Skynet doesn't know who Sarah Connor is. Remember, in the first movie, Arnold kills two other Sarah Connors before going after our Sarah? The "Phone Book Killer". Yes, Skynet can keep trying again, but, as Kyle explained in the first movie, the Human resistance found the time machine just as Skynet was sending the first Arnold back - so John quickly sent Kyle in and then they blew it up. Obviously, the machines have built multiple time machines, but we don't know how hard they are to build and how easy it is for the resistance to blow them up.
3.) a.) I don't think machines can "have" emotions - Obviously, they're allowed to show them - it would make them better at infiltrating camps and such.
b.) I think the idea is that the liquid metal can simulate living materials. And blowing up half of California early on with a nuke isn't a good idea - you'd end up blowing up Miles Dyson before he could make your chips, etc.
4.) Not a fan of alternate timelines, but if the writer understands that they exist, why is he so concerned with point #1?
5.) #5 is win. One of my biggest problems with the third movie. The first movie was about Skynet stopping John Connor (through Sarah Connor) and letting the machines win. The entire second movie was about John stopping Skynet (though Cyberdyne) and letting the humans win (earlier). Then, the third movie comes along and tells us it doesn't matter what happened in the first two movies, we're going to blow everything up anyway. Perhaps that's why I liked the television show so much - they're still working to prevent Judgment Day.