Thank you for doing this. This is actually really good feedback.
So you're saying that we should keep talking about Fighters, Rangers, and Sorcerers, eh?
Fighter is head and shoulders rated higher than Sorc and Ranger but still third lowest. .
I contrast this poll (great job btw! Come one everyone, give this poster some XP - not me, the OP!) With this one:
http://www.enworld.org/forum/showthread.php?521614-The-classes-that-nobody-wants-to-play
And it's fascinating. In your poll, Fighter and Monk have similar levels of satisfaction - not great, but not horrid either. However in the "nobody wants to play" the fighter did quite OK, while the Monk is the *worst* by far!
Monk 532 100.00%
Voters: 244