Excellent points Dubby. CTMS was way wrong. Acft held at times throughout the afternoon and then with no gaps at all, on a 3min arrival sequence, between about 1700 (or earlier?) until 2220 local. Approach worked hard all night, but it's worth mentioning the effort the arrivals sectors put in with hours of holding multiple acft, weather diversions, as well as trying to thread the departures back out through all of it.
Angle of Attack - Regarding the 6 min gap after your arrival. if you're talking about Friday night just gone there were probably a couple of these and the potential for many more. Due to almost every acft diverting around weather during that evening, most acft ended up off STAR for some or all of the arrival phase. Due to the dynamics of the weather and the pilot's appreciation of the best route around it at the time, not too many acft followed the same path. Some divert a lot, some not so much.... the result is that some can end up a long way behind the one they're supposed to be following, with a few bunching up behind them. Sometimes there is another acft nearby that can be moved up in the sequence to take advantage of the gap, which happened a few times, sometimes there isn't, hence the 6 min gap you saw. In most cases the 1st acft after any was followed by a few more a scratchy 3 miles behind on min speed.
At the end of the day, it's no one's fault, it's just trying to make the best of the cards that have been dealt on the day with the resources at hand. As P-Dubby says above, we're all on the same side, and I can assure you everyone was working professionally and doing what they could to minimise the pain/holding as fairly as possible.