I loved my experience on fighter in NGS. The combat felt so fluid and smooth. The double counter into 5th attack felt so rewarding. I love the transition to open world and the graphics looked great. I also liked the general movement between the dashing/gliding/wall jumps. I would however like slightly faster photon dash and glide speeds like for glide of there was a sprinted version (similar to BnS). Wall jumping can be improved as well.
I think they really have a solid base. I hope the actual game has alot more content and I hope down the road along with killing things out on the world they maybe add actual dungeons (raids).
Overall though I really enjoyed playing NGS to the point that when the beta was over and I went back to PSO2 I just wanted to play NGS.