Honestly, the only adults I can think of from canon who were competent and fair are Amelia Bones (who got one scene and a mention after being killed) Bill and Charley Weasley, who barely appeared at all. Everyone else either plotted around or against Harry, tried to 'protect him' even after it was obviously pointless or counterproductive, or was a bumbling nincompoop. Of course, to have a teen hero it's neccesary for the adults to be ineffective at resolving the conflict, but it still paints a pretty bleak
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows