>>306586248
I honestly just automatically disregard almost all posts that are poorly written, e.g. by not using capitalization, commata or having common misspellings. 
Not making your posts legible signifies to me that you barely put an effort into writing it, which in turn casts doubt on the quality of the actual content of one's post. We're being flooded with information, so one has to select what to read. I feel like this rule of thumb, among others, is working well for me.