In terms of movement speed that is now heavily dependent on the armor as well. Instead of Intellect, Discipline, Strength for armor ratings it's now Resilience (armor), Mobility, and Recovery. Apparently even changing the armor in the beta makes a big difference.
Your 2nd paragraph is on point with what some other people have said. The gun-play and the feedback is different for sure, and it's something a lot of people immediately noticed and didn't like. Ghaleon wrote something very similar to what you wrote right there. He pointed out that all the particle effects makes it hard to get feedback on the damage you're doing and the crits.