Disclaimer: I do not own Naruto.
Sarutobi-sensei is not perfect. He plays favourites, has a monkey that turns into a stick for a summons, and doesn't get that someone can be a kickass shinobi without being a genius or of a famous bloodline. He also doesn't see how batshit insane Orochimaru is getting, and it's starting to worry even Tsunade-hime. Still, you keep going on missions with him and your team because Sarutobi-sensei sometimes goes peeping with you, and one of these days he said he's going to teach you how to make up your own jutsu.
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Jiraiya-sensei is not perfect. He writes crappy erotica, didn't listen when you said you could totally do water-walking, even though you'd been a gennin for a total of a week, and tied you to the log even though you passed his stupid bell test(he says getting both bells is cheating). It's frustrating trying to pull him away from his manuscripts so you can get to the missions desk and do another mission, but you're beginning to learn from his terrible example and think that may have been his point the entire time.
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Minato-sensei is not perfect. He doesn't mind the mediocrity of other ninja, believes even the stupidest of Obito's lies, and he's dating a civilian woman from a fallen Hidden Village. You're pretty sure he's just waiting for Sandaime-sama to roll over and die so he can be Hokage, but there's no proof yet. But you sigh and go along with it because he's the best jounin to be your sensei and, really, you're not sure anyone else would have put up with a five year old gennin the way he did.
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Kakashi-sensei is not perfect. He's lazy and late all the time and reads that crappy word-porn even when you're on a mission and doesn't trust you enough to let you see his face or know anything about him and if it wasn't for the desk chuunin, you'd wonder if he really was a Konoha-nin because Iruka-sensei knows nothing about him, not one thing. You still go to the bridge every day at exactly the time he tells you to because you figure half the battle is learning to take orders from someone who doesn't follow through, and all the best lessons he's taught you are the ones he didn't outright say.
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Naruto-sensei is not perfect, not by far. He eats far too much ramen and not enough vegetables and makes up stupid, perverted jutsu. He wears bright fluorescent orange even if you're on a mission to Snow Country and believed Uchiha Sasuke could be saved right up until the moment he really couldn't, long after everyone else had given him up for the lost cause he was. Despite all that, you trust him with your life because you know if you ever fall off your shinobi path, he'll be right there to get you back on, even if it means he has to beat you into the ground to do so.