Peter Gibson, a spokesman for Keep Britain Tidy, asserts that Banksy's work is simple vandalism, and Diane Shakespeare, an official for the same organisation, was quoted as saying: "We are concerned that Banksy's street art glorifies what is essentially vandalism." In his column for The Guardian, satirist Charlie Brooker wrote of Banksy "...his work looks dazzlingly clever to idiots."
Some say I am a hustler, some say I am rockstar, some say I am true talent.... With a great personality to boot! Something that all these things have in common... Is that I made an impression... I grabbed their attention with my art, I make them linger with my words and a kind smile, and they relate me as I relate to them because I love what I do.
In June 2016, a 14 ft painting of a child with a stick chasing a burning tyre was found in the Bridge Farm Primary School in Bristol with a letter from Banksy thanking the school for naming one of its houses after him. BBC News reported that a spokesman for Banksy confirmed that the artwork was genuine. In the letter, Banksy wrote that if the members of the school did not like the painting, they should add their own elements.
Banksy was also credited with the opening couch gag for the 2010 The Simpsons episode "MoneyBart", depicting people working in deplorable conditions and using endangered or mythical animals to make both the episodes cel-by-cel and the merchandise connected with the program. His name appears several times throughout the episode's opening sequence, spray-painted on assorted walls and signs. Fox sanitised parts of the opening "for taste" and to make it less grim. In January 2011, Banksy published the original storyboard on its website. According to Banksy, the storyboard "led to delays, disputes over broadcast standards and a threatened walk out by the animation department." Executive director Al Jean jokingly said, "This is what you get when you outsource."
Because of the secretive nature of Banksy's work and identity, it is uncertain what techniques he uses to generate the images in the stencils, though it is assumed he uses computers for some images due to the photographic quality of much of his work. He mentions in his book Wall and Piece that as he was starting to do graffiti, he was always either caught or could never finish the art in one sitting. He claims he changed to stencilling while hiding from the police under a rubbish lorry, when he noticed the stencilled serial number. He then devised a series of intricate stencils to minimise time and overlapping of the colour.
The Westminster City Council stated in October 2008 that the work One Nation Under CCTV, painted in April 2008 would be painted over as it was graffiti. The council said it would remove any graffiti, regardless of the reputation of its creator, and specifically stated that Banksy "has no more right to paint graffiti than a child". Robert Davis, the chairman of the council planning committee told The Times newspaper: "If we condone this then we might as well say that any kid with a spray can is producing art." The work was painted over in April 2009. In December 2008, The Little Diver, a Banksy image of a diver in a duffle coat in Melbourne, Australia, was destroyed. The image had been protected by a sheet of clear perspex; however, silver paint was poured behind the protective sheet and later tagged with the words "Banksy woz ere". The image was almost completely obliterated.
Video of the incident posted to Banksy’s Instagram account alongside the quote “The urge to destroy is also a creative urge” show that the frame of the painting does not appear to have any wires attached. TechCrunch noted that the art in question was listed as being given to the owner by Banksy in 2006, meaning that the internal components as well as a charged battery inside either lasted 12 years—seemingly unlikely—or the device was primed prior to the sale by someone working on behalf of the artist. In either case, it seems likely an individual in attendance hit a remote trigger as soon as the auction closed.
Among the structures photographed prior to the opening were a large pinwheel by Banksy, Horse Scaffolding Sculpture by Ben Long, and a twisted truck sculpture, Big Rig Jig by artist Mike Ross which was previously shown at Burning Man in 2007. Works by 58 artists, including Jenny Holzer, Damien Hirst, Jeff Gillette, Jimmy Cauty and Bill Barminski were featured in the park. Banksy said he contacted the "best artists I could imagine" to exhibit, with two artists turning him down.