Well, we don't have an oven in our TT, and it was not something we went shopping for. But we have been known to bake cookies in our oven in previous TT's
We found it took the chill off of the TT before we put kids to bed and then we didn't need the furnace overnight. To be honest, we would probably make more use of an oven than we do of the microwave!
We are people who actually cook in our TT though. We use our two little burners nearly everyday and we don't bring along a regular Coleman stove anymore at all.