I'm sure it's different with enterprise contracts, but VMWare support was next to useless when I used to pay for it on 20 servers. Not once did a problem get solved, and some of them must have been pretty widespread bugs from what I recall.
I never knew Microsoft even had support. Was part of a very large (worldwide) enterprise and remember the other teams complaining about lack of anything when trying to escalate issues.
It's not different really. Either it is obvious and you don't need them or its your hardware vendor's fault (according to them). Still better than Oracle's software support, which is not a high bar.
I have had to contact the vmware enterprise support several times and while it was tedious to do so, they always managed to help us out, including when we had datastore locked vhd's after a storage crash.