Instead of making it blurry what about a twitch. Like a vision change.
I like the current suppression effect. You have no idea how impossible it was to live with the suppression effects in 2.0 while playing with a minimum specs computer. A few light machine gun shots was enough to cause the screen to blur for about 20 seconds, no joke.
Now that I have a computer that isn't crap and with which I can judge the average suppression effects as experienced by others, I think it's fine the way it is, except perhaps that submachine guns should cause a little bit of suppression if you get hit by one, namely since it's weird to hit someone with an SMG only for them to turn around and kill you with their rifle instantly as though nothing happened... this coming from the perspective of a rifleman (the class I almost always play).
That's right Johan D: I forgot that if you had a slower comp, it lasted forever. The newer the comp the faster it went away D: Would explain why they changed it :P