Why I can’t decide PHP is not good, without using PHP?

Someone asked me how can I comment on PHP when I am not a PHP programmer and never used it.

When there was a time for me to decide my programming language choice I shortlisted python and ruby. And learned both.

I took help of various blogs by tech experts at that time to conclude that PHP is not good enough to learn from scratch when I am starting new. Why not just learn some better option like python?

What is wrong in just following the opinions of the tech bloggers?

Why should I first master PHP to conclude its bad?