Just adding the experiences from myself & coworkers:
1. Points are automatically posting again at the proper rate? Nope. Even when filling out the on-line missing stay form, incorrect points/nights were added, requiring I call the 800# to straighten out what should have already been done correctly in the first place...or at least the rep reading the folio should have seen.
2. Lounges I have been in have exceeded brand standards with additional fish/meat/cheese at breakfast not required? Haven't noticed any change here.
3. All properties have greeted me at the proper level? Haven't received any status greeting, not that I really want one. I did receive a "Thank you for being a loyal member" at the last CY I was at, which is more than satisfactory for me.
4. Mega bonus brand posting posted properly without the need for me to call? Nope. Every single account required calling the 800# to get both of 2019 ones added to the accounts.
5. Suite upgrades are happening again? We've seen some. I even got upgraded to one of the nicest suites as a Gold member. I'll give Marriott the benefit of the doubt on this one.
6. Ambassador continues to respond in a timely manner? n/a
7. App and website now allow be to download bills from all properties? Nope. Still not consistent. Ironically, one of my missing stay hotels, once posted, did display a Download Bill button. Others still just show Rebook and have for months.
8. Website is mostly working? Not even close. When it's down for 16+ hours mid-week, not even close. And that's just the site being up. Never mind things like searching for destinations, sorting by price (still missing), or searching by area to work correctly. When it tells me there's only 1 Marriott hotel near Disney it's obvious the website is broken.
9. Mobile key is mostly working at several Marriott properties? Nope. I had it show up once at the last CY I was at. Fortunately when checking in I requested physical keys as well. I'm glad I did -- the mobile key worked for a whole 12 hours and then it disappeared from the app.