It's an iconic place with an interesting history. The Soviets hated the wall and would often paint over it just to find that in the morning all of the graffiti, art and complaints were re-painted. I wouldn't make a special trip but if you're in the area stop by. It's a great place to take a photo.
For what it is, it's pretty appeasing. I'm not one who's particularly into graffiti art, so this was never going to completely blow me away, but it is a visually appealing piece of art. The pastel colours used on the wall make it particularly pretty when the sun is shining. It's a nice cultural place to visit, but I would not set out more than half an hour of your day for it.