I live in Hong Kong and it is a hard time for me to connect matches except Team Arena. Experienced this problem since day 1. Only be able to play on a day or two since day 1. I am a big fan of swat and never encountered any connecting problem for swat in halo3, 4, (MCC is another joke). But now it is extremely hard to find a swat match in halo 5. And for the warzone, it is still a large joke that a message indicated that not enough to players are found which preventing me to join any match.
You know what? In my opinion, even halo4 connecting stability is better than this game.