League of Legends Patch 11.12 will see a large nerf to one the better junglers as of late, but there are certainly others who will join him as part of the worst junglers in this patch.
5 Worst Junglers in League of Legends Patch 11.12
Aside from Udyr, a lot of the junglers that are the worst in this patch have remained unchanged since the last. As the meta slowly brings tanks into the picture, those that can clear jungle camps fast and provide great presence in team fights are the current makeup of the better junglers.
With a high skill ceiling and tanks starting to transition into the meta, Lillia is a small unicorn in a forest filled with huge hunters. A small, but effective package is what Lillia can abuse for players that do not know how to play against her. However, as team fights will begin to be more drawn out with champions with higher HP, Lillia's kit can just fall flat even after a proper engage. If the enemy team composition does offer squishier champions, she can still be a menace, but it's unlikely that most teams will fit that profile for this patch.
Gwen can be regarded as one of the better top laners to play for the upcoming patch, but this does not necessarily translate to a success in the jungle. Her kit aligns with more damage, which can be great for clears, but Gwen doesn't provide enough utility to prove effective if enemies see her coming, rendering her presence and ganks to be ineffective despite her damage. Just play her in the top lane.
The name of the game right now for jungles is to clear immediately and to gank or make plays soon after. For Nautilus, his jungle clears will require a lot of time in order to do so. By the time Nautilus can clear his jungle, the enemy jungle likely would have already ganked a lane by then. He provides a considerable amount of HP for team fights in which he can stay alive, but getting other lanes ahead immediately is currently the priority in this meta.
Trundle is simply unviable until future patches can either buff more tank items or buffs on his abilities. He can provide quick jungle clears and thrives when split pushing on towers, but provides little utility for teams that are trying to secure kills. He'll likely remain in the shadows for a few weeks.
In this patch's most controversial update, Udyr seemed to take the biggest nerf to his kit, likely due to how effective he is in both solo queue and professional play. A massive change to his Phoenix Stance (R) ability has drastically changed the cone damage from 60-310 to 50-275, though its AP scaling has increased from 70% to 80%. His effectiveness in team fights will definitely be lessened, though it's likely he will still see a lot of play because of the utility of his kit. Udyr will definitely struggle in the jungle if players can't adapt to the lack of damage.