I've been following this thread, and I wanted to throw down my 2cents because I feel it's not exactly been mentioned yet.
I'm an old CCG player. I played very briefly when the game came out, then came back to it as Winter was cycling and played through the beginning of LCG. I was very psyched for LCG, because I figured it was a great chance for the game to get a fresh reboot without some of the "CCG crazy/powercreep" that effects pretty much all CCGs at one point or another.
In CCG, one of the biggest things in the game (at least for me) was house loyalty. I loved Targ. Loved it as hard as was humanly possible without being illegal in at least 48 states. That's not to say I wouldn't occasionally play something else- I frequently indulged in lanni and greyjoy. But if I had to pick a house that I really "identified" with, it was Targ. And I'd say it's safe to say, a lot of other players have houses like that as well.
So where am I going with this? The cool part about CCG, with all of it's power creep and CCG idiosyncrasies, is that you could always build a variety of great decks for each major house. Now, of course, there was the fact that the card pool was larger- that's obvious. But looking at the overall design of CCG, it's pretty clear to me that the focus was on the major houses. Each set provided some new twist on the way the major houses worked, while reinforcing each house's major deck theme-types. There were definitely power tiers- that's undeniable. But I feel like post-Winter pre-LCG was definitely the best time this game had, with such a heavy focus on the major houses.
Alright, coming back to LCG now. I'm a Targ player. The feeling I've had since CCG went away is that I can't really put together a solid Targ deck that clicks like it did in CCG. Everything I build is just so far below the level of power of most of the other houses, it's almost not worth playing. That's a pretty radical statement, but I think that Targ's situation really has become one where the difficulty of both deckbuilding and results have become drastically lower then the other houses.
The obvious response to this complaint is "Well just wait- the Targ box is coming out next!". And that's where we come full circle. It's been about 2 years since we switched to LCG only, and players should not have to wait that long for a Great House to "get good" . The current development style of rapidly introducing new themes that do not reinforce the basic strengths of the major houses clearly detracts from the focus on balancing those strengths against each other. Furthermore, introducing "power updates" to the major houses in the form of infrequent bulk packs causes extremely long "FoTM-eqsue" periods for certain houses, while letting other houses languish.
First and foremost, A Game of Thrones is a story about the Great Houses and their struggles for power. There is most definitely room for the more minute aspects of the story, but it's important to remember that AGoT is not primarily about The Brotherhood Without Banners, nor The Wildlings or Nights Watch. It is not even primarily about the Maesters. It is about the Great Houses, and how all those things I previously mentioned play into their bids for power. I'll strongly back FATMOUSE's suggestion that the game focus on the Great Houses while releasing things like Brotherhood/Wildings/Maesters as box expansions.
I'm not saying it's bad to branch out and try cool new things- in fact, that's the only way to keep the game fun. However, it seems like the developers jumped on that bandwagon too quickly, without ever establishing the solid base each house had in CCG, in LCG. Continuing on it instead of fixing the underlying problem of properly supporting the Great Houses, is a Bad Thing™ indeed.