I'm generally pleased with the atmospheric effects in AH. It is a factor, but not a major factor. In the hundreds of missions i've flown, (mostly in bombers), only twice have i had to abort a bomb drop because a target was "completely" obscured. A couple of times landing strips were fogged in, and a second approach was necessary in order to line up on the runway. That's ouuta maybe 300 sorties.
Miserable visibility that interfers with the game is pretty rare and always local. If you don't like the weather in one sector, just fly into a different sector. In fact, i believe MORE weather (even effecting multiple sectors) would be more realistic. Not all the time, but it would inject an interesting twist in the game. Any student of military history knows what a major role weather played in many engagements. Air, Naval and armored battles were at times decided more by the weather, than the balance of forces.