I've had some great fights in and around the clouds as well i think they are great!!
However as Fariz mentioned, one of the problems with most of the flight sims I have flown online is the lack of cover. The alt dweebs can be discouraged with more cloud effects.
When ya can climb to 30k to get an advantage (alt dweeb) and then proceed to BnZ at will, it starts to become an altitude war. I come into a fight at 20k and find 25k bogeys all over me.. next run I come in at 25k. The enemy sees me at 25k, he radios his teammates then they come in at 30k and so on, and so on, and so on...
You get the picture...
Larger cloud masses could change this. A cloud layer at 25k would help in keeping the fight within reasonable altitudes, the buffs would have to drop through the cloud layer to drop (YAY no more 35k porkwarriors) and the very altitudinous amongst us could climb up and have their fights above the clouds, and leave those of us who don't wish to grab for 20 minutes every run alone.
As far as how detailed this cloud layer could be... not very IMO. If it could be modelled as a very basic shape (angular) with the current cloud models scattered around its edges sparsely it would still look great I think.
Holes in the cover at random would work well too.
A randomizer of sorts that could vary the cloud layer (or layers) altitude on a daily basis or even whether it appears that day or not IMO would add alot to the sim.
At present it is sometimes possible to see dots from inside the cloud cover of AC outside of it, though I don't notice this occurring 100% of the time.
Clouds do hit my frame rates quite abit when close in; however I am running on a cacheless celeron 266 (@448) 128mb ram and a v3 3000. Once I upgrade the cpu i'd expect my frame rate issues to be significantly reduced. A 450mhz cpu these days is practically the bare minimum for a gaming machine. If you call yourself a gamer and wish to enjoy these state of the art simulations available today, you will ensure you have the power to play.
my thots....
SKurj