I know, I know: this is the guiltiest of all guilty pleasures in some ways. But I do believe that when it comes to television, one shouldn't feel guilty about what one finds enjoyable, as long as you're truthful with yourself about the quality of the thing in question. Which brings us to Bravo's Million Dollar Listing , which returns for its fourth season tonight, amid a cast shakeup that saw the departure of oddball Chad Rogers from the series and the arrival of a new face in Josh Altman. While Chad irritated me to the point of tears at times, I do have to say that I'll miss him because he added such an unpredictable, weird element to the mix. Between the pocket-sized dog, the bizarre chemistry with his girlfriend, and his social awkwardness, Chad added a certain je ne sais quoi to the mix that will be missed, particularly as he managed to get under the skin of his fellow two real estate agents on a nearly weekly basis. Josh Altman, who joins returnees Josh Flagg and