Has potential to be a great SIM, but there are a few things that hold it back.

Positives:

1. Tons of different planes. Once you make an account, you can download countless planes created by the community.
2. Great physics, flying planes is fun and take-offs and landings feel rewarding
3. The way the game is designed, it can support hugs maps for long flights and it feels more like a long flight. It doesn't feel like sections of the map are just loading in, everything seems to be in realtime.
4. Day/Night cycle. You choose what time to start at (or anytime in-game) by bringing up the clock menu and manually adjust the clock. You'll see the sky/sun/moon adjust in realtime as you wind the clock to exactly where you want it.
5. The visuals have a really nice look, especially when you're flying from evening through dusk and dark.
6. Being a modular game, supporting user created content and mods, it always has potential for new great things to come along.
7. This is a minor thing, but moving your view in the cockpit is really intuitive. You can reach down and grab the seat and move yourself around until you're seated perfectly.
8. Cockpit controls seem to work quite well in VR (flipping switches, etc)

However the negatives are what keep me from coming back to the game.

1. The map: The is quite boring. If you go to the SimplePlanes site and look at the map, it's mostly ocean. There are a few airports and islands, but if you don't know exactly where you're going, you'll be pretty much just flying over ocean with nothing to look at.
2. This is a minor gripe but I've seen others that ask about this too. You can't seem to refuel on the ground at airports. Most of the community will tell you to just restart the simulator after you land, and the developers have made statements in the past showing no interest in adding this feature. Seems like it takes a way from the immersion and the whole point of a simulation. Why even fly the plane at all? Just start the simulation at your destination.
3. With Point #2 in mind, it seems like the developers have a certain vision for the sim, regardless of what the community (or partial community) wants from it. It seems like it may be more of a light flight sim to mess around in rather than something for people that want to fly more realistically. The physics are good, but a lack of ground refueling, it gets in the way of the fun of planning some routes and doing long flights in one sitting.
4. As far as I know, planes are the only mods you can add into the game. There are user created maps, but to my knowledge you can't use them in the VR version of the game (at least on the Quest version).

With all that said, I do still give it a 3/5 and I do still recommend it. The game engine itself is already great and any of my gripes can be fixed probably with mods or minor tweaks. Flying already has great physics and when you are flying it is definitely fun. So for the price, it's still worth checking out and hanging onto if more improvements come down the line.