he's one of the best sensors (via his summonings)
he's as smart as Shikamaru http://narutobase.net/manga/Naruto/271/13 4th panel
even before ms he was the rival of a guy (which means he was similar level) who defeated an akatsuki
he became a jounin at a very young age
he copied 1000 jutsus
he's one of the strongest jounins in Konoha
he was trained by Minato
and all I hear is
"Kakashi is nothing without Kamui"
"all he has is Kamui"
people should stop underestimating him because it makes them look like ignorants