Comparision screenshots, frame rate information included, all settings on Enthusiast:
r_useedgeaa 0
r_useedgeaa 2
Normal 2xAA
Sorry for the large screens but unadultered, full-size screens are the only way to convey the graphics and their differences across properly.
You can see a pretty huge difference between 0 and 2 edge aa. 2x edge aa and 2x proper AA also look almost identical, with 2x edge aa having practically zero performance hit. It's pretty much a no brainer which kind of anti-aliasing to use here. Anything other than 2x edge aa (r_useedgeaa 2) takes far too much performance loss for the amount of graphical lustre it gives. 4xAA especially.
r_useedgeaa 0

r_useedgeaa 2

Normal 2xAA

Sorry for the large screens but unadultered, full-size screens are the only way to convey the graphics and their differences across properly.
You can see a pretty huge difference between 0 and 2 edge aa. 2x edge aa and 2x proper AA also look almost identical, with 2x edge aa having practically zero performance hit. It's pretty much a no brainer which kind of anti-aliasing to use here. Anything other than 2x edge aa (r_useedgeaa 2) takes far too much performance loss for the amount of graphical lustre it gives. 4xAA especially.