I can hear the sound of a multiplayer kill now, so good. The weight of the characters, the balance of the guns, and the multiplayer maps were all great in Killzone 2 and 3. I remember having amazing matches all the time playing these games.
Shadowfall would maybe have been great with another 6 months or year of production, but man those multiplayer maps and modes were awful! Still, I'd buy another Killzone for sure.
Old school TDM that's actually balanced would be a godsend, but apparently that's too much to ask for these days-or not what the kids are into anymore. Killzone always had amazing visuals so that would be enough to sell it. The lore too, just a great shooter and while Resistance was solid too back then, Killzone is just way cooler and a more interesting world.