4 pawns attack

I often play the 4 pawns attack as white when the opponent does the kings indian defense. Now, one of my recent opponents called it "dubious". I dont think its dubious its a very good weapon against kings indian. I think he was just angry because i defeated him. What do you people think?
You think the 4 pawns attack is "dubious" or do you think its playable. Personally i dont see any problem with this opening.

You should encourage people to think it's dubious (that way they'll underestimate it).