I like the walking dead, but last two seasons just deviated too much from the central plot of the walkers. I think that nothing that is shown in that serie, even if it's good, can be compared to the epicness of this battle, just meant that.
In terms of tecnical quality this episode tops Blackwater. If you like drunk cersei much more than a pair of giants kicking some ass probably it's only a matter of points of view.
All the people saying this episode is bullshit, you deserve to watch a pathetic money grabber serie like the walking dead. Not even have the intelligence to appreciate hard work that the production have made for this epic battle.