I have no originality and no will to design the terrain or mechanics of maps, so I only modify maps that I think are good and can be re-balanced to be made better... I only do RPGs..
I really hate rigs and unbalanced classes in maps, so I always remove or modify those to make classes more balanced and rigs to be less rigged and more of just secrets, I really like the idea of hidden triggers, chests, rewards, etc... so I add a lot, but mostly just minor rewards so as to not screw up the game balance...
I'm sure a lot of people hate me for my mods, I steal maps, I steal ideas, but I don't care, I just like making and playing fun balanced maps...
Enjoy them if you like...