So from the Operation Blood Orchid patch many new things came and changed a lot of the older systems in place like the lighting and the start of map optimization. However, one change that has seemingly been hidden from the general public is that post-processing and render anti aliasing have been essentially merged into one option. This wouldn't have been a bad change except for that they have added T-AA onto the temporal filtering option which makes the game a bit of a blurry mess. This blur is very apparent and makes it a bad time for lower end gamers that need the FPS boost of temporal filtering but dont like the forced T-AA. So after a little bit of searching, the gamesettings.ini file happens to contain a hidden setting to help reduce some of this blur. To do this follow the steps below.

1. Locate gamesettings.ini
First go to your documents folder then go to the "my games" folder.
Then click on RainboxSix-Siege.
Then click on the folder that represents your UPlay ID which is going to be unique to you.
Inside is the afformentioned gamesettings.ini file which is what we have been looking for.

2.Find the Setting
Do Ctrl+F to bring up the find command.
Then search for TAA.
The first one is the setting we are looking for, TAASharpenFactor

3.Change that Value
What value you change it to is up to you, however I would recommend anywhere from a value of 1 to 0.5 for the best results. Though personally I prefer 0.55 as its about as close as I could get to how it looked before and values of about 0.7 and higher become a little too sharp for me.