747 is landable, but under very strict conditions, since its physics are terribly bugged.
You have to land at around 150kts with full flaps at less than 200fpm, otherwise the plane will bounce like crazy and try to loose the centerline.
The plane is barely landable with crosswinds, any correction after touchdown will result in a 20º bank to the side that will feel as if the plane was about to flip over.