Whirlpool MH1160XSQ Microwave Review

We purchased a new Whirlpool model MH1160XSQ over the stove (as opposed to counter-top) microwave.  It works fine, but I am Very disappointed in the size of its turntable.  For a large microwave (a 9 x 13 casserole will fit in there), the turntable plate is so small.  Why?  The turntable plate does turn, but if you put a 9 x 13 casserole in there, the casserole will not turn since the turntable plate is so small.  The inside of the microwave is about 20 x 14 inches, but the plate is just 11-1/2 inches round.  Why so much extra space?  One plus is that when you set the timer, it will continue to beep until you push the cancel button.  Some people may not like that, but since I'm really busy, I often miss the first time the timer beeps, so this way it continues to let me know that I've forgotten something.  Also, since it is over the stove, it has a fan and light -- both have 3 settings (hi, lo, and off).  The Whirlpool model MH1160XSQ microwave works fine, but I would not recommend it to my friends simply because of the small turntable plate.