Nope it shouldn't. Yes, fighting 3 sunsingers can be a pain but is very doable. Look if you see the other team with sunsinger. Simply do not feed kills. Try beating them 5-0 or 4-1, whatever just don't give the warlock kills. Also memorize which tag is the warlock. Play smart. If you kill them back away just in case. Also when the round seems like it's over, still go revive your teammates just in case of a rez. Hell if you wanna ban self rez, ban invisibility by the hunters. IMO that is the dirtiest low class move ever if you have to cower in invisibility just to get kills.