I love the world of Devil May Cry 4 the most! It's the most imaginative out of the four: with a unique blend of environments, both indoors and out. From the coastal town of Fortuna to the snowy mountain ranges and even to a tropical jungle!
In addition to that, there are many monsters to be fought in the game. Some of the monsters, like the lizard-like ones, resemble dragons. There are creatures that look like wolves. There are winged supernatural creatures (Angels, Wraiths). And there are giant-sized gods! O.O
Many of the monsters in DMC4 are based off of fantasy creatures from fairy tales, mythology and folklore. The DMC4 team sure did make good use of their skills to create such imaginative, in-game mythical creatures! Much more imaginative than the badly-designed monsters in the reboot.