That 'win' he got over Avetisyan is technically the same one that Kerr got over him: both Duarte & Avetisyan basically wanted a way out & quit. But they both quit because they were... overwhelmed.
You cant assess both fights differently.
Those 3 fights you´re talkin´about:
1- like it or not, Kerr was literally the boggeyman & considered a top 2 P4P dude back then, one of the 2 most feared fighters [the other one bein´Igor]
2- he got caught against Tank, who was legit dangerous in the 1st mns of the fight [ask Don]. Well, shit happens...
3- The Dirty Bob fight was his final one, & indeed not a good one [pro fighters rarely end their career on a good note...]...
But...
would you consider it a legit loss? What happened in that fight?
Now...since you asked about somebody that 'mattered'... Was Avetisyan, a freestyle wrassler, a legit quality win?
When it was all said & done, Mikhail had arguably
3 other 'high profile' fights in his career:
1- vs Igor in IAFC > Loss
2- vs Assuério Silva in WVC > Win
3- vs Horn [final fight] in IFC > Loss
But...
were those Win & Loss really... legit quality ones?