We have only been using this for about 3 weeks now, mainly using the microwave which works great. 
We were making our meal today which required the use of the Oven for baking.  The Oven went through all the required settings, we set it for 375degrees, then allowed us to put the timer at 2:00 hours, about an 1:45 we went to check the temp in the food and the oven temp had dropped to 123 degrees and would not go any higher. We took the food out and baked it in our stove Oven with no problems. 
I then tried the broiler setting with no luck, still would not go any higher than 116 degrees.  So based on that I give this Oven a definite below average.  Next thing I have to get in touch with Frigidaire and have them troubleshoot the Oven.