I've been using Microsoft Flight Simulator since the latter stages of Alpha, throughout the Beta and was one of the privileged few to be allowed to show the simulator off on the run-up to release.
Let me start by saying that MSFS is not perfect. It has its bugs, it has its quirks, it's not perfect. But then again, what simulator is? Everything has its strong points, everything has a weakness.
Visually, MSFS is lightyears ahead of anything and everything the market has on offer right now. Five years ago we were in awe at how Laminar Research streamed OpenStreetMap data into the simulator to create a world that followed correct roadways and city layouts. We didn't think it could get much better, as anything more was far from reach. Half a decade on, we now have satellite imagery bring streamed directly into the simulator, producing a world that looks just like the real thing.
Default aircraft are also rather good to fly. Not perfect, but when you look back at their previous release of FSX (we don't talk about Flight), systems-wise we have a lot to play around with. Asobo has done a fine job on what towards the latter stages have been a rather restricted timeframe. To get the simulator out and in the state with only one or two teething issues, is phenomenal.
You can refund the sim and return to FSX if you want, but all I will say is one thing. The next time you fly over good 'ol Tylldalen in Tynset, Norway; take a look outside the aircraft and tell me what you can see, presuming your VAS hasn't tipped over the edge and crashed out before you get there. ;')