Generally when I suggest someone avoids something it is because it is bad or harmful.

“making mistakes SHOULD NOT be acceptable for an airline, of course now on the point that no airline perfect, but near perfection is important. Thats why people avoid airlines like Aeroflot.”

The inference is that Aeroflot makes mistakes and makes no effort to correct or learn from these mistakes.
(of course there is no supporting evidence of this either so we can merely take it as speculation.)