Adaptive Fog (which made things a bit more clear [left at default])
Clarity (which further improved clarity [left at default])
MXAO (which added ambient occlusion, which basically makes lighting/shadows more realistic based on the geometry [set to 1.5])
SMAA (which is a form of anti-aliasing, which smooths out jagged edges [left at default])
Here's some screenshots of the effect:
Off:
On:
Spoiler:
Now, with all the effects installed, it increased load times by quite a bit. It added a solid 20-30 seconds to the normally instant load time of both the menu screen and a game. You can bring this down however, by removing any effects you wont be using. They are located in your madden install folder (generally: program files\EA Sports\Madden 08) in the folder: reshade-shaders\Shaders. I simply created a new folder called "Shader Backup" and moved all the effects I didn't want into that folder, just in case I wanted to use them down the road (make sure you leave ReShade.fxh in the Shaders folder though, or you will get errors). I then opened MaddenShaderPreset1.ini (or whatever you named your preset file while setting up reshade) and removed all references to the effects I wasn't using, leaving me with this:
After that, the game loaded much quicker. Here's some screen shots of the reshade menu before and after I removed the 40 or so unwanted effects:
Spoiler:
After some tweaking, it works well and has minimal performance impact (my computer isn't particularly beefy, I'm running an old 2500K, a GTX 970 and 16GB of DDR3 ram). One nice thing I noticed, was that the Anti-Aliasing has less impact on menus and overlays than using NVIDIA Control Panel, and has the added benefit of a toggle key to turn the effects on and off. All in all, I'd say give it a try