I have a Camp Chef oven with a two burner stove top. It doesn't take a lot of room and hooks up to a standard propane tanks. We use the oven about as much as we use the stove top. It's great for breakfast (biscuits and gravy, quiche, breakfast sandwiches, keeping food warm while cooking the rest of the food course) and dinner (pizza, lasagna, french fries, beer battered fish, quesadillas, nachos, spaghetti stuffed garlic bread) and also great for deserts (brownies and cookies).
Basically, the oven is great if you have the imagination and cooking wherewithal to use it. If you don't plan on cooking anything that doesn't involve an oven, don't get it. We purposely did not install a microwave because when we're camping we're not in any hurry to go anywhere or do anything. We'd rather spend the time preparing a meal and drinking a few beers than nuking a frozen burrito for 90 seconds.
Also keep in mind the oven requires quite a bit of fuel to warm up and stay at temperature, but it's a very clean and versatile alternative to a dutch oven. The dutch oven can better cook larger dishes more efficiently at higher temperatures, but it requires a bit more work in regards to prep, cleaning, and storage. To me, the propane oven is a happy, lazy alternative to greater cooking abilities over a simple grill or stove, but limits the setup and cleanup requirements that a dutch oven requires.