these days a lot of artist make amazing games like raze or zombotron, armor mayhem and others. but what do they lack. multiplayer, more weapons , better graphics
write some games and what they dont have that makes them better maybe their will be a second with those upgrades
Customization for weapons and stuff,more choices,more variety of weapons insteand "thiz bestest wepon in all categories" every weapon suiting diffrent playstyle of a player. Look at Borderlands,now imagine that weapon system or just a bit similiar and it will be amazing. And yeah,Union City had an awful ending,so were the barely 5 side quests...