Diagnosis. OR, A PUN: Die, agnosis

I am slow and dense 
with anything blessed with 
anything less then previous overthinking 
and consequence, 

in examination digressed, dissected 
deformed, re-warmed, undressed 

I have expertly messed in everything. 
Except what I haven't encountered upon. 

For everything that, 
I misclassify. And treat it as if 

I had already won. And found out 
and known all through - it's that thing 

I've pondered upon, 
and won something. Of course, I've 
a vested interest in 

every found good, and proved 

I have been. But 

It's grievous fault 
to misclassify. I have done my best, 

but I always try.