Hi, I'm Rashida. In my opinion graffiti can be art and can be rubbish. It depends on a place where graffiti was painted and also depends on a skill of an artist. Banksy's pictures are really very, very professional and eye-catching. If artists decorate a boring wall of an old building or a long grey concrete fence with their bright skillful pictures,  it's very good. But I wouldn't like to see graffiti on the Shard's  or on the Gherkin's walls.