streckfus
I appreciate everyone's feedback!  Sounds like there are some who've found ARC 2 to be very useful, and some are on the other side of the fence.
 
I should note that I took the largest amount of measurements possible (15, I believe), all of them within my primary listening positing.  Some additional info about my setup:
 
My mixing desk is about 1 foot away from the wall and centered between the side walls.  The desk is quite large and has a monitor shelf.  Due to space limitations, I can't put my monitors on stands so they're sitting on that monitor shelf on top of Primacoustic Recoil Stabilizers.  I've got Alesis M1 Active MKII monitors.  Yes, you may snicker.  They're all I could afford when building the studio, and without a proper room, I don't think it makes sense to dump a bunch of cash into better monitors. That's money better spent on treating the room.  :)
 
Others have talked about ignoring the graph/picture and instead looking at ARC 2's impulse response.  Where would I find such a thing?  Aside from the resulting before/after graph after taking measurements, I don't see any other options for detailed results/analysis.
 

fwrend
My questioin to the OP: so, what's the difference "audibly" between Arc ON and Arc OFF post-treatment? Regardless of what the chart shows, perhaps this would speak more about the difference between actual treatment and software based correction.

Just a thought.

To be honest, audibly ARC 2 sounds bad when the correction is on.  Some have stated that turning ARC 2 makes their speakers sound great, I've found the opposite to be true.  The speakers sound quite peaky and glassy, but I understand that ARC 2 isn't necessarily going to make the monitors sound better; it's designed to make the mix sound better by accentuating/attenuating frequencies that are problematic in the room.  I haven't done a full mix with/without ARC 2, but I have done some quick tests by throwing an EQ on the master bus to tweak the sound of the mix in accordance with what I'm hearing through ARC 2.  (Yes, I disable ARC 2 when I bounce.)  I've actually found that the mixes sound better without monitoring through ARC 2, then again, I haven't done a start-to-finish mix using it, and throwing an EQ on the master fader isn't the same as tweaking individual instruments as the mix is built up.  (Plus, the mix was a work in progress anyway, so it was far from perfect to begin with.)
 
I definitely need to do some more experimenting with ARC 2 and eventually I'll figure out if it helps my mixes or not.  If not, at least I got an extra mic out of it. :)