East Side Gallery is not really what is commonly thought of as an, "Art Gallery." What it is, is a…read morelong section of wall where various artist exhibit their work by creating one of their pieces on the wall.
Yes, it is a little bit strange.
East Side Gallery is a really a very long wall. There are a lot of artists that have their work showing on this wall. Just like beauty in in the eye of the beholder, so is art. Some of the work along this wall is very good. Others, not so much.
All this being said, it is an interesting concept. And, it is something that you should see if you are in Berlin. Just don't get your hopes up to experience something truly revolutionary or cutting edge. Remember, it's just a wall with a bunch of paintings on it.