This forum is simply not "bash or get out." There are plenty of prequel fans here. Since a lot of people come here because of Chefelf's reasons there do tend to be more people who are not fans than are.
I've found most people here being perfectly willing to have amiable discussion about the prequels and their merits etc. That being said, coming into a topic and opening with something like, "Are you guys insane?" is not really a great way to win anyone over.
As far as putting a numerical value on movie based on rottentomatoes.com's assessment of various reviews I think that system is used far too much in debates when it's a completely meaningless system. Particularly when everything is either Good (+1) or bad (-1). Look at some of the reviews that are rated "fresh":
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"A flawed masterpiece."
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"For once, the words ‘A long time ago in a galaxy far, far away’ seem ironic, and it's hard to watch what follows without drawing comparisons to our own political landscape."
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"Final installment still far cry from 70s pics."
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"Got Wood? Christensen's stiff acting almost sink this digital ship. The last hour is absolutely brilliant."
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"If only this had gotten out of the starting gate a little quicker, it would be an unqualified success."
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"Growing up Star Wars is like growing up Catholic- no matter how bitter you might become, ya can't shake it. Last week I bought CHEEZ-ITs because R2-D2 was on the box."
C'mon. This is just a sampling of the positive reviews that add up to that 82%. I'm not a fan of 5 star scales either but that would be far more accurate than rottentomatoes.com. People put far too much stock in that site.