I'm ambivalent about the FPS aspect, although I'm sure plenty of more combat oriented players will enjoy the strafing, hiding behind rocks & walls & headshot opportunities, as mentioned it should bring in a new slice of the gaming community too, and perhaps give new players a more familiar setting (on foot combat & maze navigation) to start from so they don't feel they are starting completely from scratch with a 6 DoF, no up or down, staggering distances between things game map.
I'm looking forward to having more choice on how to solve existing challenges though, and (to a much lesser extent) having more to do (more content, more vistas to park in front of, more assets to see). I like the way the revised multi-crew has been described, with hopefully better team integration between ship, SLF, SRV & feet on the ground.
But actual walking about aside the things I'm looking forward to getting all seem like they should have been there already. Simple stuff like being able to land the ship while the SLF is deployed, or having multi-crew work with the SRVs.