Quick! Hide. Your improvment is showing!
The beginning of G.I.N,A. 5 is amazing; you really improved since the first part. You employ 3d seamlessly and your dust clouds, explosions and electric effects are great. The girl really appears to slide across the floor and the fight is inspiring.
However there are awkward elements, especially in the dialog scenes of the second half. Lipsticking, with few exceptions, did not fit the voice acting very well. When a character emphasizes a word we should be able to see it in the lip syncing and facial expressions. We should see them pronounce every dominant syllable. Additionally, the lines are hard to understand. The lines do not flow into each other; Instead each line appears to be a separate entity. This problem is compounded by improper grammar. I had trouble in some places understanding who is saying what and what is being said. You might want to consider finding someone to proofread your lines and help with voices plus mixing. Remarkably the storyline is fairly understandable through the well made fights alone.
The second half also had glitches with the 2d animation unconvincingly interacting with background. The most problematic scene is the one in which the captain walks forward, into the camera. I assume this is meant to be a dramatic pause but the awkward walking cycle and length of the scene undermine the effect. I know from experience that animating a full body character walking into the camera is difficult- many animators avoid it completely. Showing only the captains upper half as he moves forward, leaning with a darkening facial expression would prove more effective and less difficult.
The one special effect element I dislike is your fire. Fire should be more than one color and less blocky, maybe even partially transparent.
When its all said and done you have a wonderful series going here and thinking about how your improving as you make these has me excited for how the next one could turn out. Not that this episode is anything to scoff at! Well done!
PS
What do you use for your 3d?