My main problem with T3 was the casting, but I thought it was just about as good as a third Terminator movie could be. It had all the right elements. I don't understand the hate. Sure, it's nowhere near as good as T1 and T2 and it un-does all the "no fate" stuff from T2, but how else could the story continue?
T3 had a menacing villain. It also had bad-ass scenes like flipping the crane, carrying the casket through the graveyard, tormenting the psychiatrist that was in both previous movies (love his reoccurring bit), tearing around in the hearse, ... I even liked the funny versions of the call-back scenes (like the clothing acquisition at the start).
T3 was not a great movie, but it was a fun spectacle and I wasn't disappointed.
T4:Salvation was absolute shit. I hate that I wasted the time and money to ever watch it.
"Kyle Reese! Got to find Kyle Reese! Kyle Reese! Kyle Reese! Kyle Reese!"