I have a number of sims. A large number actually.
They each have their place. Whether FS2000, ProPilot(yuck! maybe this one doesn't have a place), F-15, USAF, IAF, USNF97, F-22 Lightning III, F/A-18, Longbow, and so on.... actually getting tired of typing the names.
X-Plane rocks. Version 5.65 is out.
You can fly through the clouds... Not a grey screen, but actual textured clouds that allow glimpses every now and then. The flight model is fantastic. You can design your own planes, get planes others have made and see how they did it. Fly in your neighborhood with your weather. Just like it is outside your house. Tell me one other sim that will let you do these things???? Granted the ground scenery is a little lacking, I admit, but I am flying to get in the air, not driving a car. I would like somebetter textures and maybe to see my town a little more modeled. If someone out there would like to take a crack at Object Maker and World Maker I'll send them a copy of the map with my house marked on it..... haha.....
Just my opinion. And on this one....... I don't think I'm wrong. Read Peter James' review here at Flightsim.com..... he knows what I am talking about!!!