Hm. I have to thank you MovieBob: as a hardcore Terminator Fanboy (I snuck in to see the first one in the theater when I was 14), I was ultraconcerned that this was going to be complete dross; I'm perfectly fine in going to see a Terminator movie that is big on spectacle and not necessarily on story, as long as it actually gets the spectacle right. Hopefully, there will be an 'unrated director's cut' of T:S coming out some day that addresses the shortcomings you mentioned-- or at least restores the Moon Bloodgood nude scene!
As a side note, I don't think we'll see many huge-budget highly complex action movie anymore: Hollywood is convinced that the money should be spent on big bangs, bright flashes, and loud noises...
...and the sad thing is, they're probably right. You think the movie-going public today really wants to strain their brains considering time travel and causality loops?
EDIT: I realized something just now-- the reasoning behind the PG-13 rating is probably so they can cultivate a younger fanbase. I guess they're getting tired of us 30-somethings and our money.