I can only speak for the Dominion mode since I don't really play Skirmish or Elimination that much but for the last week I noticed an increacing amount of instability when playing.
What happens regularly now is that near the end of a match when one side is losing and the players ragequit to not **** up their precious winrate the game can't seem to cope with more than one player leaving the server and it just freezes. This forces the remaining players to kill their game via Task Manager which not only forces them to restart their game and go through the long loading time and unskipable cutscenes but it also prevents them from gaining their XP and rewards for the match they just won. This is extremely frustrating.
Another thing which I had happen twice now is that when a player leaves, the game kicks up to four additional players and resets the Dominion points (the two bars in the top right corner that determine when the game goes into sudden death) and the individual points of each player (the ones you see next to each player in the scoreboard). This not only makes everything you've done up to this point in the match obsolete but it also can leave you as the only player in your team and you're now forced to start from scratch with three bots at your side.
These problems are insanely frustrating and make Dominion mode unplayable. I like the game and I may even be willing to play it while the stability problems makes it completely random which team wins but if I have to kill the game after every second match which prevents me from making any progress I don't get any enjoyment out of it.
Let me know if you guys experience the same problems. Is it like that in the other team modes too? Is there maybe even a way to avoid these problems?