Any of the WWII simns are just games, with flight models usually tweaked from some earlier sim. I seriously doubt if an average person with no flight training could get a P-51D off the ground. But EVERYONE can do it in a PC sim. What does that say for accuracy? People with no tailwheel training would also very likely never get one down and stopped without a groundloop but, again, everyone in a PC simulator can do it.
Get a WWII fighter at 250 mph, bank to ... say ...75°, and pull has hard as you can. Think you'll get a turn or a whip-stall / spin after a wind-up? The sims all get a pretty decent turn from that maneuver.
"Any of the WWII sims" is now a little exaggerated. Though what you describe certainly stands true for most "older" sims, if you play, say, DCS