Downloading PC mods for WWE 2K15 offers a range of benefits. Firstly, mods can enhance the game's graphics and gameplay mechanics, providing a more immersive experience for players. For example, mods can improve character models, arenas, and special effects, making the game look and feel more realistic. Additionally, mods can add new features, such as new wrestlers, championships, and game modes, which can breathe fresh life into the game.