How is it skewed?
It's a serious question. ENWorld is probably the biggest community of D&D players outside of Wizard's own forums.
Are ENWorlder's progressive? Anti-4e? Pro-4e? Are you saying that this message board is not representative of a community? Is there a narrow focus. I've heard passioned arguments that ENWorld is now a "pro-4e" or an "anti-4e" site.
Granted, you could be getting bias. But at the same time, maybe the poll speaks volumes. Right now we're probably one of the best statistical samples you can get of the D&D playerbase. At the very least it's an indication of trouble.
It seems nowadays (in general, this isn't targeted at anybody) if you don't like an argument now you attack the methodolgies or the person's motives. I would rather look at the poll and say "okay, it seems like this is a very controversial move", then look at other communities, etc.
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Others have said this better than me, but each time an online poll is cited as an example of any relevant information I have to chip in.
The one thing all scientific polls share is, a representative (ususally random) sampling model. You want to measure ENworld opinoin then EVERY SINGLE ENWORLDER needs to have a chance to answer the poll. If you don't visit the boards, don't visit the 4e boards, don't like posting or don't enjoy answering online polls -- you have a 0% chance of being included in the sampling.
On the other hand, if you are a pro- or anti- 4e zealot or the kind of person who LOVES answering online polls -- you have, limited only by your awareness an interest -- a 100% chance of being included in the smapling.
Any research that you can 'volunteer' for, click on, or sign-up for is self-selecting. Mind you they are not completely without merit for qualititative analysis (though even for qualitiative stuff, randomly sampled focus group testing is far preferable) -- and on that count you could conclude from the online poll "Boy there are a few people on ENworld who really don't like 4e".
But beyond that limited (and subjective) analysis, but do these polls in anyway represent this community, or the 4e market as a whole.
Not even close.