A fragmented player base brought on by new year to year versions instead of add-ons to a base game.
A weak, difficult, and time wasting multiplayer experience brought on by said fragmentation and lack of basic functions like rank/matchmaking or even the simple ability to add someone to your steam friend's list while in game. This in addition to the general problem of online games being invisible to the player or knowing how many people are online playing at a given time - thus giving the impression of a dead multiplayer experience. Hell you can't even vote to restart a multiplayer match in-game that you might have drawn no lands in.
Confusing, overpriced DLC that often ends with people not knowing what they have bought, have already, or should have and thus ends with a multitude of complaint threads on these forums.
Slow UI, slow load/boot up, problems with card selection/assignments, & genreal bugs that seem to never be fixed year to year as one game is thrown out for the next.
This game has now 4 editions 2011,2012,2013,2014. The consistency between all versions seems to be a lack of attentiveness to increasing value to the basic player experience through debugging and improved multiplayer funcionality while adding as many ways to fleece the player of their money.
This combination of problems diminishes intrest year over year and will eventually lead to a product few want because those potentially interested have already had some form of irritation or negative experience with a past iteration of it.
The future is dim for a product that adds little - if any - value, year to year, while holding fast to the mountain of mistakes in its past.