I agree that Red Baron 3d (out of the box) was inferior to Flying Corps as a flight-sim "experience" while "in game". however, there are LOTS of patches. if you have the time to download the 60 meg Western Front Patch from from swwisa.net I think you'll have the best WWI flight-sim out there.
add the Promised Land Graphics and the Western Front Patch together (you've got to use a campaign manager to use the date-based patches) and you've got the BEST WWI flight-sim experience out there.
JG1 (an RB3d Squadron) started a "Flanders in Flames" online tournament that's probably the best online WWI flight-sim experience I've ever had. they have a one-life-per-night rule during tournament sessions and they (along with several other squadrons) work very hard at producing a "realistic" flight-sim experience. I don't believe "Flanders in Flames" is still being conducted, but you can find the patches online...
Honza, the Red Baron 3d you encountered 6 years ago can't be compared to what's actually being played now. you've got over 100 different aircraft being modeled, and the damage and flight models are MUCH better. I agree, with RB3d that if I can take out 7 Nieuport 17s in a Fokker E.III during a campaign that something is terribly, terribly wrong.

the patched versions of RB (as previously described) are VAST improvements.
I haven't seen any other games offer such a great immersive experience... Flying Corps simply does NOT work for any of the computers I've had in the last 6 years. I really liked what I saw there... especially with the scenery based on WWI maps, and the mission builder was superior to RB in power and versatility. the AI gunners were a bit TOO good, though... it was like
Frederick Libby and
Rene Fonck sitting in the back of every two-seater taking turns perforating your skull!