I'd like to chime in with my own personal experience: I haven't been able to play multiplayer DCS seriously for a while because of the absolutely incredible server instability. I got so frustrated after the 50th time ACG's server had crashed mid-sortie that I just went and played BMS because somehow P2P servers on a 20 year old game are more stable.
I will probably never play DCS singleplayer in any meaningful capacity and my sole interest in this simulator comes from content provided by the multiplayer community. My patience for the constant problems introduced in every update wore off a while ago and I'm left staring at the joystick in my closet.
Seriously, ED, I love you guys, but please, the multiplayer side of this game needs a serious overhaul.