In low Elo:
1) Play a tanky jungler and lose cause your Carrys deal no damage before the 40 min mark.
2) Play a damage jungler and lose cause no one in your team is tanky enough to initiate.
3) Try a Bruiser build and end up totally useless without damage and useful amount of survivability due to lack of gold.
Many games end like that when you are jungling, and there is nothing you can do to change that. I had games as Nautilus with a 0 0 6 at the 5 min mark that my team still lost in the laning phase. But there was nothing more i could do than permagank.