Modo's render engine isn't bad, far from it. Certainly not given its price. β However, it's no match for Vray or Maxwell. Have a look at the gallery over at Luxology.com. Not that many great looking interior renders in there. There's a handful, certainly, but those came into being, I'm sure, at the expense of very high render times.
While I quite like Modo's renderer, I wouldn't mind an extra option. π