Personally, I am bored of European fantasy. It's too familiar and the same. I like the Witcher cause it's Eastern European, but I wouldn't want that many more of that.
The reason I picked Roman or Middle Eastern is that in terms of RPGs, I cannot recall a single one in either period, where it's full of potential. Even if you wanted high fantasy, both settings can deliver (well granted, an ancient Greek setting would probably be more interesting than Roman in high fantasy). And in low fantasy, their history is full of awesome.