Looking back on old maps, A lot of them were just plain ugly. A few bumps with an awful grass texture, how nice! Slopes, however, was an excellent map. This combines the style of maps with modular terrain to make the map actually look like it belongs in the game. It looks so much more fitting than some high-poly smooth terrain with highly detailed textures that looks like it was taken straight from Garry's Mod.
I hope other people have the same approach as you when making new maps.