How to (almost) always get into a game
This is how I manage to almost always get into a game that isn't laggy on my first attempt.
When the list of games show up, scan over it and look for ones that are nearly full. Those games are not laggy (hence why people join them). Next, look for games that have a lot of people but are 2 - 3 people short of the max. So, if a game holds 12 people, look for one that has 9 or 10 people in it. I've found that trying to join a game with only one open spot always leads to you getting a message saying that you couldn't join.
And there you have it. A non-laggy game that doesn't have just one other person in it!
Hope this works for everyone else.