As long as maps, items, vehicles, weapons, etc. from other games are made into blocko style, they add possibilities to the game and increase the amount of fun you can have. Some of my maps are based upon gta, but there are hardly any exact refrences to the game. I made the textures look like blocko bricks, which distances the maps from gta, and added many new features that make it unique. Also, the maps are huge to current standards and expand upon the fun that you can't have in smaller maps. And tommybricksetti is right about the gravity gun and the portal gun, they have added so many new possibilities to the game. I think that converting something from another game into blocko style in a way makes it new and unique to how it was in the game it came from, as long as effort is put into it and it is somewhat balanced to everything else.