When I first heard about it, it generated a deep and heartfelt 'meh'. The last trailer (which I would've LOVED it if they hadn't revealed the plot point it exposed) might have raised my opinion of it at the time of viewing. I'll still go see it, because killer future robot, but I am not expecting it to be mindbendingly great.
The first two were really good to great. Rise of the Machines was completely awful as far as I'm concerned, Salvation was at the lower end of 'meh' but it did not pain me to watch it.
Sadly, I'm likely to be one of the dweebs that enables them to continue making stuff like this because I'll see it in the theater. Not opening day, but in theater.
Wiley.