I forget who said this (PM me if you know): But, there is a difference between a flight simulator and a flight-plan simulator.
MSFS has always lagged behind the combat sims where flight models are concerned (although had better navigation) and often lagged in terms of graphical quality (although covered larger areas).
As for the terrain - the elevation maps look nice - if they did that for the whole world it might be impressive. However, I've always been disappointed with both MSFS and X-plane for a lot of locations (eg. outside the U.S.A.). The trees are also too widely spaced and all the same type.
The basic fact is that Microsoft builds sims based on accountants, marketing firms and the bottom line. They simply can't do a good job creating simulations with these priorities (compared to 777/NeoQB/Gennadich, Maddox Games, Graviteam or Eagle Dynamics).
That said, I'm glad - Oleg will have to give us the new cloud model now...