Lip's the only one with a level head on his shoulders

He quit drinking, got a job, he went out of his way to try and save his professor from self destructing, he got Brad cleaned up when he fell off the wagon and saved his marriage. He then helped Sierra out with her dad getting out of prison.

Lip has been the only that hasn't fucked up this season or done something stupid, sure he tried to bait Charlie with drugs but he immediately went back and got them and realized it was wrong. He then even helped Charlie get back with Sierra even though he really loves her.

Lip has just been an awesome dude this season.