I don't know if it's its been mentioned before, but I just realized, The Leaf Village has a really sucky method of training new ninjas. Look at all the super powerful badass ninja's from the leaf who take on a group of three ninja.
1st and 2nd, they have the 3rd a super awesome good ninja and Danzo a super awesome evil ninja and I guess another ninja don't really remember from the flashback
3rd: Jiraiya, Orichimaru and Tsunade. 1 super awesome good ninja 1 super awesome evil ninja and Tsunade.
Jiraiya: Pein, and his two side kicks and Naruto. 1 super awesome evil ninja and 1 super awesome good ninja
4th: Kakashi, Obito, Rin 1 super awesome good ninja and 1 super awesome evil ninja.
Just gotta hope if naruto never gets a team of Genin to train.