It sounds like you're describing a bunch of issues and conflating them into one problem. I can't speak to your specific issues and I 100% believe you're experiencing all of them - although soft locking and players failing to load into sessions - you'd need to be specific about where and when. But I can tell you that we continue to monitor and improve, correct or fix issues as we discover them.
It sounds like you're unaware of the issues plaguing everyone in this thread for months now, despite us and everyone else and FAT's mom complaining about them all the time.
They are not one problem. They are all their own problems, and they happen on a regular basis. The current build and/or servers are not stable. Sometimes these issues occur at the same time. Ex: Search with party in playlist (it doesn't matter which, it happens in everything, literally all the fucking time) -> get match -> countdown happens -> loading screen comes up with spinning circle in bottom left -> game never loads and just sits with spinning circle until you "quit the build". Sometimes it will just kick 1 or more of your party back to the lobby. No error message or anything, they just don't load in while everyone else has no problem. Sometimes both of these issues happen at once. Sometimes the entire game just hard-crashes while loading into a match. Sometimes the game hard-crashes when opening REQ packs (no detectable pattern here). If, by some miracle, the servers are cooperating, you can expect the game to hitch (freeze) at least once per match for no particular reason. This is in addition to the hitching that already happens nonstop in Social playlists when people quit or join (LITERALLY EVERY TIME SOMEONE LEAVES OR JOINS THE GAME - this has been an issue through multiple updates at this point and is also annoying). Framerates: months later and we still have the ~20fps forge maps in Matchmaking. There's no way no one notices these things before pushing to the public and for it to be an issue this long afterwards is frankly a joke.
On top of all of this, being guaranteed to play against Mexicans, even at peak hours US almost like clockwork, leading to opponents that teleport and skip all over the place the entire match (this happens to folks who live further north and east than I as well), is super swell.
Either you're actually unaware these things are happening - meaning you haven't read much of this thread, or twitter, or... anything Halo related, or played the game at all in the last two months, or talked to anyone who has - which I don't buy, or you are aware and are just giving a safe, PR friendly response. In either case, this doesn't inspire confidence.
As I've said before, I'm holding out until March, because I enjoy playing the game - when it works. If these issues are still prevalent after the promised update, I don't know if I can continue to suffer this nonsense when I have plenty of other perfectly functional games to play. I understand it's not your job specifically to fix the game, but being a higher-up and essentially being unaware that your main title is *literally broken* is ridiculous.
EDIT: Seriously, just read some of the posts ***on this page*** above yours. This is an everyday complain cycle in HaloGAF, man.