Shortly after moving into an apartment with an old electric oven, put in a 12 lb turkey to roast at 350 degrees. Looked at it in an hour and a half and it was brown and fully cooked.
The thermostats do not always work correctly in ovens. Can only iterate that one should always have an oven thermometer. They are so cheap, particularly compared to the cost of a few ruined meals.
Did learn how to cook in an oven that only went full blast. Would not recommend the procedure routinely, but it was a small victory. When you are young, just married, and living in a place where almost nothing works right, any small victory seems large.
Before criticizing a person, walk a mile in his shoes - then you are a mile away and you have his shoes!