Pretty much the same as the first.
There are like 3 new enemies, but basically the same game play. Switch out the police station for the military base, hotel for the ship.
At least they had more tables to fix/upgrade/create weapons at and access to more gun ammo.
All in all I liked it, it was familiar. I liked the fact that you could bring your previous character with their ranking into this one instead of starting all over. Too bad you couldn't bring you weapons with you.