lol this was a hot topic.... when he was released a year ago. But anyone asking for a nerf probably hasn't played him.
He's a pretty underwhelming character overall, his current role is noob-killer, and stalker of antags, since he can just pop up while they are busy with another raider. He had so much hype when we were waiting for him to come out, then when he got here, the community was collectively underwhelmed. But those that die to him still asked for nerfs lol. Nothing has changed in the 1 year since his release.
He's a worse, closer-ranged Harec. Everything doldren can do, Harec does better. They both can 1-shot headshot, but Harec has infinite range from any angle, Doldren is bound to the ground and has an effective range of like 15 meters, due to damage falloff. Doldren can 1-punch with a total character build? Harec can 1-punch with 1 card. Doldren has a mobility ability, Harec's stalk is so much better than Doldren's 1-way teleport that throws a squishy local into battle and can't get him out of it. AI almost always reacts perfectly to his CQC if he teleports near them, and experienced players get pretty used to his 1-trick pony routine.
Lots of characters can 1-punch, including every Wardog which are significantly more sturdy than Doldren's mighty 60hp. Even council can 1-punch using their Surge cards. Those cards are pretty bad, but you can effectively have a powerful shooting tank that smites anything that happens to close the gap.
Try playing the character before demanding nerfs.