I liked the game a lot, but I quit for a couple reasons.
First off, they did a poor job playtesting Set 2, so certain cards (Zealots) were overpowered at release. When the fan reaction forced them to nerf these cards, instead of balancing them properly like they should have done from the beginning, they took the lazy way out and weakened them to the point of being useless. And while they were at it, they nerfed some other cards (including an Ultra Rare card that players paid a lot of money for) that were never ovepowered to begin with.
And then, to top it off, your stats aren't saved to their servers, but to a locked save file. When I replaced my PS3 because of GTA 4 freezing, I could not transfer my EoJ save to my new system, and my stats from playing hundreds of games online were gone. Do any Japanese developers have a clue when it comes to online gaming?
From what I gather browsing EoJ forums now, the game is dying. The 2.01 nerf patch has created new balance problems that are as bad or worse than the zealots, and a lot of the top-ranked players are cheating by creating rooms with animations turned on, which no one but noobs will enter, and then having a buddy enter the room and immediately surrender.