I did the same, went out and bought CFS3 because I was so impressed with FS9 I thought it must be as good at least.
Boy did i get taken for a ride!!
I spent a whole Saturday messing with it first telling me my computer couldn't run it etc. (yes my computer is well above the mims) and tweaking and everyting else and it just sucks!!
I know that even though I have never flew in a Mustang that they don't handle like that!!
The grapics suck, even after upgrading my ram and video card.
I just got sick of trying to set it up to run halfway decent on my machine I removed it and put it on the shelf.
I have yet to try IL2 but belive I'm going to buy it this weekend. I think if you read what is here and at other forums you'll see that it is the one to get.
I never tried CFS2 so I can't comment on it but I'm debating buying it just because of my experiance with CFS3!!
Until then I'll enjoy flying my warbirds in FS9.
I've spent