Worst Aircraft Ever?

Wired has a photo top-ten of the worst aircraft in history:

10. TU-144, the Russian Concorde.
9. De Havilland Comet, the first British jet airliner.
8. Spruce Goose: Howard Hughes' folly, too much, too late.
7. LWS-4 Zubr, an ugly, nearly unusable Polish bomber.
6. The Christmas "Bullet": two flights, two dead pilots = perfect record.
5. Beechcraft Starship, the most photogenic of the bunch. One of Burt Rutan's great ideas that didn't take off.
4. Hiller VZ-1, personal hovercraft.
3. A-12 Avenger II, the overly expensive naval stealth fighter that Dick Cheney killed.
2. B.E.2, the WW1 British biplane that made the Red Baron famous by providing ripe targets to shoot down.
1. XB-15, the underpowered, jumbo fortress.


Notes:

• Many of these are merely prototypes, where their notable flaws or other circumstances caused the to be canceled. The most obvious exception was the B.E.2, which should have been replaced before 3500 were built and pressed into service over the trenches of WW1.
• Though failures in their own right, some of these prototypes provided important innovations to the aviation industry. The XB-15 and Rutan's Starship come to mind.
  
• Other planes, especially Hughes' Spruce Goose, were victims of politics and/or bad timing.
• If I were making the list, I would limit the list to aircraft that actually went into production. Still on the list: B.E.2 and the Polish Zubr. Added to the list: Antonov An-10, the Brewster Buffalo, the Blackburn Roc, ME 163, et al.