Jabawocky,
From my little part of the world I've
observed the following (which is probably systemic, rather than individual and
NOT taking a shot at military ATC). This being observed over 14+ years of operating into YWLM:
1. Apparent lack of appreciation of standard turboprop descent profiles, leading to excessive intermediate descent limitations at altitude. Such limits then requiring extra manoeuvring/track miles (and higher workload to both the ATCO and aircraft crew);
2. Apparently poor capability to handle a moderate number of IFR's compared with civil ATC;
3. Excessively long co-ordination times (on the ground), ie. getting a release. Understandable when there is a recovery under way, but more often than not there was maybe 1 or 2 other civils in the airspace (see point 2).
4. Late (and sometimes "unusual") changes to clearances when on Approach/TWR.
Overall, I had "less confidence" in the system when operating IFR under military ATC. Make of that what you will.
As I mentioned previously Jabawocky: I'm not taking a swipe at the ATCO's, merely posting my observations over the past decade or so. Once again I reiterate I NEVER had a problem when operating VFR via the lanes.