My most recent UNICOM experience:
Advisory traffic information in the immediate terminal airspace and movement area.
Got that - would have anyway all aircraft in the area were IFR.
Meteorological information such as factual statements about the weather.
The aircraft on the ground gave me that. Unicom operator only had access to the auto-met data which was 20 minutes old.
Emergency services alerting.
Didn't need that, but it would have been available from Centre if required anyway.
Other aerodrome information as requested by pilots which could include runway surface conditions and availability of fuel services.
Had to ring the refueller myself when I got there - outstanding service.
I have limited experience with Unicom type facilities. 1) Ayers Rock - relative little traffic - a jet or two inbound - quite useful. 2) Broome - reasonably busy (in my experience)
Yes you probably do have limited UNICOM experience - possibly none. Both Broome and Rock have CAGRO services. Different legislation and level of service.
As mentioned before the AFIZ and remote AFIZ were excellent. They provided a slightly better level of service that we now have from a CAGRS and somewhat more the we get from the unicom.