Echoing sentiments about the servers tonight, just played for 2 hours and was obviously on European servers going by the names of the players. Incredibly frustrating and has made my group of friends and I not want to play matchmaking again until it's fixed/reverted. Didn't have a single issue with finding games on Australian servers at all times of day on all playlists, even 2-3am, so I really don't personally understand the logic of broadening the search.
I'll play again tomorrow in peak time but I don't expect to find any games on local servers given the feedback here and elsewhere.
I'm very much hoping that it's all reverted due to all the backlash but if not, it's so disappointing that we're finally able to get a Halo game with local dedicated servers and zero lag, have it all be suddenly changed and then have them just go unused.