Kakashi had always the hardest fight, always babysitting somoene and always facing new vilain who are protected with plot (reserved to naruto).Kakuzu never solo'd him he was with hidan while Kakashi had to babysitting team 10. Kakashi said himself that he could kill Kakuzu with kamui despite to finish to hospital.
Kakashi was already winning against Pein, untill Choji clan came to waste everything.
The only reason Itachi won against im is because he fougth 3T Kakashi who were babyisting Kureinai and Asuma btw.
Kakashi already solo'd Obito .
Kakashi already solo'd Minato arm with kamui.
Madara one paneled Sasuke face to face.Kakashi already owned Madara's defense in normal condition whereas Madara got him while Kakashi was half dead.Kakashi beating Madara would not make sense.
Orochimaru stand no chance against MS Kakashi, but if you talk about part 1 then yes since he was the big vilain.
Sasuke failed to kill Kakashi whereas Kakashi has no intention to kill him and he still owning him without sharingan.
and Countered his multiples susanoo arrow despite not wanting to kill Sasuke and one shot him like he was going to attempt when Obito and Zetsu came to save Sasuke.
Kakashi handled perfectly multiple tailed beast, he was even going to solo the 6 TBB with kamui.
Kaguya never fought Kakashi.
Kakashi fought the whole aktsuki apart Sasori and Konan and only lost to MS Itachi while he only had 3T sharingan, he handled Kisame easily in part 1.He owned Deidara ,He handled both Hidan and Kakuzu in same time while babysitting team 10 and he said himself that he was going to one shot Kakuzu if Naruto didn't come that time, he was winning until Choji clan wasted his perfect plan, he won against Obito in kamui dimension, last hit was Obito only option to survive as he said he profited of him and still admitted that he lost.
Maybe your thread would make more sense if you asked "has Kakashi ever been bad"?