Yes, Frankopan's Silk Roads was a disappointment to say the least, I was really expecting an enlightening history of the middle east, starting from the early interrelations between the various civilisations (Egypt, Babylon, Harappan) and the progression through time (for example mentioning the Periplus of Roman adventurers into the far east). Good histories of China (Goldman/Fairbanks), and India (Keay) had whetted my appetite, and I think I'll need to read Dalrymple to be fully sated.