What’s the point of remaking a movie only 30 years old? It’s not as if times have changed so much in three decades that today’s audience couldn’t understand yesterday’s film. Especially when it’s a movie that uses the time-honored subject of a man forced to choose between love and money. Clearly, there was no reason to remake the 1981 Dudley Moore film “Arthur.” But, despite my best efforts to dismiss the new movie, I’m sort of glad someone did. The 2011 “Arthur” is obviously a vehicle for comedian Russell Brand — and he drives it with panache. No other actor could play the man-child so well, utterly believable as a spoiled heir taking full advantage of his privileges, yet hinting too that there are depths to this shallow man that make him deserve our attention for a couple hours.