Well,
I'd go with a couple of the Japanese Float planes. The Bi-plane Type 0 Observation plane (Not the Float Zero, that's an entirely different plane) was about as manouverable as any modern acrobatic plane. Just not as strudy ;-)
Also, I do know the WORST turnfighter in WWII. At least if you define fighter as "any aircraft used to for CAP or Escort Duties."
It's the B-17 (in various configs).
The B17E (either E or F) was used as a CAP fighter by US Carriers in the South Pacific in at least 1 instance. They flew in from ground bases, and circled the carrier as CAP (I'm not making this up) to protect from Torpedo and Dive bombers.
Luckily for all involved, no enemy planes showed up.
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Ouch out
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[This message has been edited by Ouch (edited 04-03-2000).]