Although the Hummer H2 might appear to be a contentious choice on this list, it is there for a good reason. It came out in 2002 and caused a lot of issues for both GM and drivers. The Humvee, the standard, upmarket replacement for the Jeep as a military vehicle, serves as the foundation for the whole Hummer line. Hummers are huge, have a distinctly military appearance, and consume a shocking amount of fuel. The H2 became a significant issue for GM and did not remain on the market for very long due to the energy crisis and other international political issues. The Hummer brand eventually went out of business as automakers became more environmentally sensitive.