Its annoying and I turn it off almost immediately. I may play with it on for a few hours to see how the gimmick is implemented into the gameplay, but I always prefer controller precision.
The quip I hear is rumble supposedly increases player immersiveness in the game, but not in a million years would I want my mouse to rumble when I play a PC game. I want precision in shooting, cursor movement, and steering. Always. This is purely a gimmick that console games try to force on users. I can only remember one time that it was implemented well, Psycho Mantis in Metal Gear.