I stayed 4 nights at 3 Marriott properties for our first visit to Munich this August
Titanium.
I don't (or very rarely) ask about upgrades or invoke Marriott guarantees - even when I know I should.
Apologies to the community.

1. Roomers, Autograph Collection - 1 night
We got a silent upgrade. And a welcome gift as well. But no recognition at all on check-in. Front desk was meh.
Late check-out when we asked the next morning was no problem at all.
We had dinner at Izakaya. Cool venue. Really good service. I was disappointed in what we ordered for the crazy price to portion ratio. Nothing was exceptional except the service.
Great breakfast. And the breakfast staff was fabulous. As well as the coffee.
I really liked this hotel and location.
Easy to get to from MUC
Summary: As an elite, we got a silent non-suite upgrade from a basic room, 4 p.m. late check-out and a free fabulous breakfast. And 1,000 welcome points.

2. Caro & Selig, Autograph Collection Tegernsee - 2 nights
Another silent upgrade, as in no mention of it on check-in though it was an upgraded room.. We were offered a 4 p.m. late check-out on checking in. But no mention of status at the desk and no welcome gift in the room.
We had dinner on the roof terrace and despite the poor service, we had leisurely drinks the next afternoon. The staff on the second visit was outstanding.
Breakfast was great. Great coffee again. And, service at breakfast the second morning was perhaps a bit too attentive.
I really liked this hotel.
Summary: As an elite, we got a silent non-suite upgrade, 4 p.m. late check-out and another extensive breakfast. 1,000 welcome points.

3. Marriott München (Berliner Strasse 93) - 1 night
I did a giant error and did not realize there were two "Marriott' hotels in Munich. I meant to book the airport hotel.
No upgrade. I didn't ask. The room was exactly as booked. Dated. Status was mentioned on check-in and 4 p.m. checkout was offered at that time.
The special elite area in lieu of a lounge was disappointing even though I was not expecting much. Certainly better than nothing. Think low North American standard without the alcoholic beverages and you may not be disappointed.
We had a glass of (one selection red and one selection white) mediocre wine and then went out for a really good local dinner nearby - with brusque service. In this lounge, you should opt for the beer for sure.
One could probably get by eating in the elite area if you're not too particular about health or palate. I did not try the soup though.
I would stay here again without complaint. Though, prefer Roomers (out of just the two Munich hotels in which we stayed).
I liked the location for what we were doing. And getting to the airport was pretty speedy by Uber.
Summary: As an elite, no upgrade (we did not ask), mediocre elite area in lieu of a lounge, average breakfast. Dated hotel close to transit. We got a whopping 1,750 welcome bonuses.

Caveats:
I'm getting more particular in my older age. For leisure stays, we're booking higher category rooms so there is less room for a hotel to offer an upgrade.
I've contemplated the 'benefit' of the elite status I have in a few chains. Certainly, I've gotten value out of it. But, I was really getting disappointed by the failure to impress - even slightly. So, now I go in with no expectations. Ahem, rather - I try to go in with no expectations.

And we're still targeting stays to Marriott hotels to reach lifetime platinum in Marriott for at least one of us.

Finally,
Recent stays in Poland have probably skewed my experience for elite status Hotels in Warsaw have amazing lounges and elite recognition (especially compared to Germany). Sheraton Warsaw has set the new bar where we've stayed over 60 nights the past 18 months.