People concerned about pings affecting gameplay should not worry if its below 300.
"Edited just to let you guys know I registered on these forums just to post the below Reply/message"
To all those who are worried about pings affecting the gameplay as it is an FPS game should not be concerned and those who are saying they are facing problems should actually look into the game mechanics first !.
Reason being, This game Overwatch works on the mechanics called "Favour the shooter" which basically means, if you shot someone in your screen in your PC even though he has moved away from there before 0.2 -0.3 seconds you will still deal damage and he will even die after. ( people seemed to get hooked from the wall corners or shot behind walls after peeking out because either you or other player had latency issues and if you see the kill cam, he basically damaged you at the right spot in his screen ! I have many friends playing on even on 4g networks smoothly in overwatch due to this mechanics of the game and in most instances they prefer staying on 4G with compared to PTCL lined in even due to later being having random ping spikes with compared to the former. even on 230 to 250 pings they have been playing fine.
I am based in Dubai I usually get 120 pings on average and with my room mates etc, downloading stuff or straming youtube it keeps on jumping up and down with even 280 320 at some instances during my gameplay, but the game still remains playable, the above instances increase which I mentioned, but affective damage dealing abilities does not change nor does the performance in compromised ! Blizzard has done an awesome job with this one here !