You know the one plane I don't have a problem with is the N1k. Maybe it's because I'm a Jug or Pony driver and tend to come in fast. They don't handle for crap at speed. Occasionally I get surprised at their zooming ability and get tagged, but most times they are not an issue.
Then again, I don't seem to be seeing many N1ks around lately either. Hmmm.
RWY, to a point you are right. There is always one or two planes that are considered to be "the best" at any given time and you will see lots of them. Normally it is Spits, but we happen to have some later planes to take the crown. It will always be that way in an open main arena. However, there is light at the end of the tunnel... the Perk system. The perk system may just decrease the numbers of certain planes and lead to more variety in the arena. This may be the online sim with the least issues in this area after 1.05.

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Lephturn - Chief Trainer
A member of The Flying Pigs
http://www.flyingpigs.com "A pig is a jolly companion, Boar, sow, barrow, or gilt --
A pig is a pal, who'll boost your morale, Though mountains may topple and tilt.
When they've blackballed, bamboozled, and burned you, When they've turned on you, Tory and Whig,
Though you may be thrown over by Tabby and Rover, You'll never go wrong with a pig, a pig,
You'll never go wrong with a pig!" -- Thomas Pynchon, "Gravity's Rainbow"