We have a massive area with greenhouses as far as the eye can see next to my city. It is very ugly, I must say. And on Google Maps it is not a nice sight as well. Besides, they are highly automated, but many still need a lot of labour for the picking of the fruit/vegetables. For that they need cheap labour, and they are often exploited, not good either. Benefits are year-round production, very high yields, and low water needs. Drawbacks are the the relative costs, energy use, labour exploitation, and ugliness.