There are some Microsoft products I genuinely love, but some are terrible. To an extent it is a reflection of the inconsistency in internal teams. Culture, values, skill level, and quality bar are all over the place depending on who you talk to, even compared to other large companies.
From what I had heard, CosmosDB was not a healthy team, and I would not consider using it as a product.
I suspect the way Microsoft does interviewing and performance management (very local to the specific team) contributes to the inconsistency.
MSFT has also been fairly open to its employees that it does not try to compete with competitors like Google, Meta, or even Amazon, in terms of compensation. So it isn't really trying to get the best engineers, so long as it can continue to print money.
There are still folks there who are incredible, but the floor is shockingly low at times. Folks will self-select, so you will then get teams which are more homogeneously good or bad.
I think pay is certainly a factor in talent bleeding to G/Meta in general, which they refuse to address. I imagine this isn't unique to MSFT.