Welcome Lyanna and I like your choice of a user name and avatar.
Well, the last episode had both Ghost and Grey Wind in it. Although, it spurred Bark-gate. The Producers have said that they use the dogs playing the roles of the direwolves when they can but it can be very difficult to work with animals who do not preform on cue. Not making excuses but just repeating what they have said.
The wolves have been there at the crucial moments when they needed to be: Discovered as pups, Summer killing the assassin, Nymeria takes down Joff, Nymeria is chased away by Arya, Sansa walking Lady, Lady is killed, Summer on Bran's bed when he has his dreams, Ghost scaring the crap out of Rast, Ghost going beyond the Wall with Jon when he says his vows and bringing back the hand, Grey Wind chewing off the Greatjon's fingers, Ghost alerting Jon to the wights.
As for Cersei, in my opinion she is a very human character (one of the most human) in the books and the TV series and I think they have done a good job to show how she attempts to protect her children above all else, which means grabbing and keeping power. The beauty of GRRM's writing and how they've portrayed it onscreen is that you are never truly sure 100% who is good or bad or what their true intentions really are. You can like or dislike characters but it all comes down to points of view, or how GRRM portrays the main protagonists.
Anyways, how does one put a 694 page book into 10 hours of TV screentime? By making choices about what scenes are important, how they are portrayed, how the story flows to ensure it's comprehensible and not disjointed, what characters does one focus on, how does one not lose the audience given the depth and complexity of GRRM's world, and how do you put all that written description, back-story and internal dialogue onto a TV screen while still making sense and not losing the audience. As GRRM himself said in his current writting of an episode for season 2:
writing the first draft of my script for episode nine of season two of the HBO series GAME OF THRONES, "Blackwater," and damn, but this one is a bitch of an adaptation, the original author made the damn battle way too big and too expensive,
Eulalia had it right above. We can play that Game of Television Budgets for a long time. I believe LOTR fans still are and Peter Jackson has moved on.