I was foolish enough to buy x-plane 11 the other day. My nosiness got the better of me. As a glider pilot I flew the ask21 glider. Oh boy, did it disappoint! Her my findings:
xplane has a bad thermal model (no sink at the edges, no life cycle, way to wide a diameter. I could actually fly straight for 10/15 seconds in the thermal on mediocre settings. Those things are huge!). FS 2 has a better and more realistic model already (life cycle, sink at the edges, accurate width of the thermal core, etc.) and they will get even better in the near future, while xplane does not speak of such things.
Frame rates of FS2 are way, way, way better then xplane. Yeah, there is a lot more going on in xplane, but the generic scenery is really meagre and not at al convincing, while FS 2 without any addon looks absolutely stunning.
Instruments. the vario in fs2 works like a charm. Its a nicely modelled, modern instrument. The vario in xplane is a outdated type with no compensation. It's pretty useless.
Sounds are bad in xplane. I wonder what the **** the have been doing the past years that there newest version is still so bad at so many points.
All my respect for the small team of Ipacs and what they have achieved already.