Hm...it's losing its luster for me too, but not for those reasons. I've encountered matchmaking problems before but being in a good region allows me to find a working lobby almost immediately afterward.
I had all these plans to climb the rankings, hit 40/40/40 and just pick one stat to mass promote...but for absolutely no reason I was playing yesterday and felt little interest. Like a switch was flipped. Two uneventful perilous speedruns and I just thought, "...maybe I should do something else tonight." I think it occurred to me that promotions were the only thing I had left. Got multiple of my most desired weapons, played all the levels at every difficulty countless times, played every class to my liking...
I didn't expect it, but I guess that was my limit. Wonder if that's happening to other, more casual, players as well.
I have played with V3gan before. I think I happened to random into a lobby run by friends of his, maybe a few weeks ago. At my low promotes compared to theirs, they carried me pretty effectively. Think I carried my weight, but it felt more like I was walking beside three whirlwinds of death. They let me stay for two runs and then I left out of guilt and, partially, boredom. Certainly didn't seem very elitist.