I have learned that it is better to microwave the meals in parts and pieces than as a whole.
For the burger, I take it apart. I microwave the burger first. Then add the cheese for a few seconds. Then i wave the bun alone for about 6 seconds. I put it together on the plate, and you would never guess it was a frozen meal at all.
Same goes for the dinners. Sometimes I remove the vegetable, and microwave it separate. It avoids things getting overdone or dry.
Take the time to wave it right...it pays in flavor.