It's ironic that that old Psygnosis game, AWESOME, was far from what the title suggests.
No one has mentioned THE SETTLERS yet. It was the most complex god game of the time, and introduced a fully working economy. I still don't know how bluebyte managed to do it on the A500, although you do need 2MB to appreciate it properly.
LEGENDS OF VALOUR anyone? For the Amiga it was certainly unheard of to have textured 3D graphics in an RPG. It was playable as well, and quite immersive.