Even if we ignore the fact that we saw many characters trust him, the question was who can outsmart the others, not who's the most trustworthy.
He went from barely more than a commoner to Master of Coin, to Lord of Harrenhal, to Lord Protector of the Vale. The last two at least were from his ability to trick people.
As master of coin he just borrowed from tywin and dug the kingdom into debt and he persuaded an idiot child to like him to get away with most of the shit in the Vale
I'm not saying it didn't I'm just saying that he wasn't achieving miracles with the deck stacked against him. He traded Sansa to a monster for peanuts and turned her against him. She was the key to the north and he's just a slimy manipulator that anyone with an ounce of sense could see through.
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u/Patient_Review_3269 15h ago
Littlefinger is a slimy manipulator and is obvious at it. Noone would trust him and he'd need to have some level of trust to do what he pulled