Yeah, they suck and get kilt by people flying them.
There are plenty of aircraft in the game that turn better or do at least something better.
Also, let's face it, the majority of people who fly Spit 16s, La7s and N1ks for that matter are impatient and of below-average skill. It is not difficult to out-wit them.
Personally, I think Spits are awful to fly and I have no idea why they're so popular. To each their own, though.
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4 cannon Spits..... why not? Provided they flew as badly as the instant removal of the second bank of guns would suggest, I think it would be great.
Perhaps when/if the perked load-outs become a reality this would be a good idea. There are still lots of things that need to be re-modelled and added before that.