I don't think I ever finished "War". I thought "Rise" was kinda cool, a different take on the concept, and "Dawn" was okay but a little convoluted. By time I started "War" I realized that I just wasn't interested.
I'm a big fan of the 1968 original, and have also read the book by Pierre Boulle. The original movie keeps the concept, just turns it around a bit. I fully recognize that the sequels in that original series tapered off in quality as they went on, but there is merit in each of them, and there's actually some logic to how it all played out.
I guess that affected my enjoyment of the new trilogy, because I kept thinking that it was a different and kinda cool way to go, but at some point it has nothing to do with the book anymore, or the original movies, and it's just some story based on a similar concept, and once I realized that, I found that I just didn't care about it.