My main issue is the combat looked sluggish on a gameplay level, not just an animation one.
The gun moved awkwardly, the sway was over exaggerated, and either the guns had ridiculous spread or enemies were overly bullet spongy for how they appeared.
On top of that, the HUD felt cramped, cluttered, and seemed to be just a little bit behind the action. The helmet intruded far too much on the screen. Simple squad UI was figured out back in Republic Commando, which had a "tactical" visor that gave the needed information without cluttering the screen or removing a third of it.
The gun seemed centered on the screen in the Doom style, and the barrel of the gun was not lining up with where bullets were going.
In addition, the zero-g combat seemed incredibly awkward, with the sluggish gunplay being exaggerated by sliding and a difficult movement environment that slid players into walls and corners.
On a non-gameplay related note, the developer wasn't fooling anyone with that dialog. The demo was poorly paced, the commentary was awkward and obviously fake (change to a serpentine formation, Ta-ta-uh-tango down), and the crowd didn't seem into it at the beginning (the one guy yelling "Use the knife", people cheering to "shoot someone").
This demo made me regret them adding an FPS mode, not be excited that I can board ships. I'd rather have a better space sim than the ability to board ships in awkward, unnecessary sections.
Yes, I know it's "pre-alpha" or whatever it's called now. But these are game mechanic issues, barring the HUD. Major changes are needed, not balancing or tweaking numbers. If they're confident enough to demo it, that likely means these major components have been decided on, with limited options to change.
Evolve is currently in Alpha, with bugs being shown as crashing, balancing or matchmaking issues. There are issues, and big ones at that, but the gameplay seems locked down and satisfying. Star Citizen does not appear the same way, and sound or animation changes are unlikely to change that.