Yeah, it may not work as expected (that we will connect to the server we want rather than just failure). But it works for me.
The only reason is I dont want to be blamed by teammates just because Blizzard put me into a wrong server and I have to play with 150 ping (usually 16ms).
Some of you may worry about losing sr and you’d better wait since blocking server ip and “failed to connect to server” would result in a competitive penalty.
I don’t play comp much and I care about game experience more. It will be extremely terrible if the whole match is laggy.
I will add rules on WIndows Firewall to block the whole /24 (for example server ip is 24.105.30.129, i will block ip from 24.105.30.0 to 24.105.30.255) so I won’t join this server again.