There’s a lot of things that are lacking:
- Not enough lighting
- Missing multiple jetways
- Lighting off in VMC daylight conditions
- No pilot-controlled lighting
- Beacons not showing up until you’re on top of them, but meanwhile you can see approach lighting from Neptune (also this)
- Runway guard lights
- Way more than these, above. This is just the tip of the iceberg.
And when someone raised a bug report about hangars being too large, they closed it as “won’t fix.” 
The hangars, beacons, and approach lighting bother me the most because I can’t imagine those being too difficult to fix.