Maybe it is just me, but especially the alien models (both on official screenshots and on my computer) almost seem like they are only flat shaded (diffuse texture only).
Normal maps might not really show much without lots of dynamic lights, but are spec maps implemented? Or are the corresponding textures missing and/or the effect set to be really weak? I think the great alien models would really shine (pun intended) or lets say look much better in game if this could be improved.
Otherwise... well I guess that's part of the idea of this game, but the overall "feel" of the game, i.e. movement, behaviour, sounds etc. (everything but the models) are still very much like Tremulous and thus make the game seem very dated. If at least the sounds would sound less like a game from the 1990ties it would probably help a lot.