They deliver hundreds of Model 3's each day, hundreds across the country. You read a post on the forum from someone new maybe one every 2-3 days? Let's be generous and say 10 new complaints a week. That's but a tiny fraction of all the happy Model 3 owners without issues with their cars.
The nature of online forums is you mostly get people who are reporting something bad, or they're just waiting for delivery. The happy folks without problems? They're out driving their cars, showing them off to friends, making excuses to go out again an hour after they just got back home, etc.. Unfortunately there's not much you can do to make these people to stay indoors and make posts about their positive experience.
Worth noting some of the issues people complain about, or reject their cars for, are issues many people don't care about and would gladly take delivery of those cars well ahead of schedule. My car had a small paint chip barely noticeable below driver's side door, so small I didn't notice it until a week after driving my car every single day. It's going to get fixed, small paint chips get fixed all the time easily by detailers. Would I rather not take delivery of this car and wait for weeks or months longer? Hell no. No panel gap issues, nothing out of place on the interior, nothing is falling apart, and my car was built in June when things were rough.
If you are just waiting for delivery, it helps to not frustrate yourself by camping the forums.