Overall, the experience has been pretty positive. I took a couple hours fiddling with the system settings, preferences, and all that jazz (of course!). Of note, I'm now using the proprietary Nvidia graphics driver as opposed to the FOSS version (that was selected by default). There was noticeable improvements to the rendering/responsiveness speed right away.
I snagged Steam and will be trying out one of my games (X3: Albion Prelude) as it is my *only* game that works on Steam Linux.
I also immediately grabbed some of Nehe's code for setting up opengl programs since I hadn't done windowing/graphics code on Linux in the last decade or so and I've completely forgotten what I was doing and I'm anxious to start porting game engine tech to the platform.
I did crash the window manager once trying to run "glxinfo | grep OpenGL". To be fair, I think I did this command in a terminal while I was changing the graphics driver... so fair deal.
Firefox was noticeably glitchy and generally unpleasant, so I put Chrome on here, much better.
The only really annoying thing so far I've noticed is that I can't seem to middle/wheel click a webpage in Chrome and scroll around by moving the mouse (like you can in Windows)... so that's kind of annoying.
All in all, if it wasn't for several Windows-only games, I'd probably ditch Win7 completely. I'm pretty impressed where Linux has come from in the last 15 years or so in terms of the general desktop (aside from the amazing tech fueling the OS itself of course).