Localizer only no GS. Most of the FMS units I have flown have the capability for the pilot to set up a "fake" VNAV (Glideslope) to maintain a rate of descent rather then step downs on approach. If so, maybe the setting by the pilots was a bit too steep allowing them to strike the hill.
You would think they would want to get as many people on the earlier flights as possible, as delays cascade throughout the day and more people have connection issues. Had the same problem on SWA, same situation. This is very stupid policy and shortsighted. Oh well, those MBA geniuses at the airlines are obviously smarter than their customers--just ask them!