As regards to the action over the films.
I feel what separates the action set pieces from the first two films and the latter ones is the sense of suspense and anticipation in the build-up to the action. For the most part nowadays you're in a scene with dialogue, and then Bam! Your in an action scene. This method feels like its done as a jolt, or for the shock factor to keep the audience on their toes.
And then when it comes to the action, those of yesteryear were more reliant on practical effects and doing things for real, whereas now it's cheaper, safer and easier to just shoot in front of a green screen. But in doing so you lose the realness and atmosphere, I feel, as well as the feel of natural physics.
Having said that the CGI work in T2, carried on from the Abyss was groundbreaking.
This can all pretty much also be contributed to most films of yesteryear compared to those of the more recent and modern era's.