Our belief is that the residential fridge benefits outweigh the drawbacks. Although a residential fridge requires AC power only (not propane or AC/DC) the motorhome must have an inverter to provide power when not plugged in or using a generator. Depending on the motorhome and the fridge, the inverter may last only a few minutes to several hours. New RVs tend to already have the inverter sized accordingly.
We recently replaced our traditional Norcold fridge with a Haier residential fridge and are completely happy with it - we get more stoarge space, quicker cooling and more consistent performance. We had to add the inverter but the whole project was well worth it in terms of satisfaction. My wife loves the ability to put a whole gallon of milk in the fridge and I like the ice cream not being so soft!