Overall, I found episode 6 to be pretty poor for a few reasons:
1). I find Arya's story extremely dull, uninteresting and in some ways inconsistent. Get on with it!
2). The Jaime & Bronn vs the Sand Snakes scene was crude, comical and not very believable. It was daft that they all so easily infiltrated the Royal Palace in the first place (unless it was a deliberate ploy by Doran to lure in and trap the plotters?). Also, the fight was poorly choreographed and didn't make much sense: Obara should have easily defeated Jaime and Bronn should have easily defeated Tyene. I'm just hoping that we'll get a lot more Doran in the next few episodes as he's barely been developed so far even after 6 episodes.
3). The Faith Militant and Cersei are really getting on my nerves, as is the incompetence of the Tyrells in responding to this threat. When you control the most powerful region of Westeros and your heir is imprisoned by a gang of poorly organised fanatics, are you really going to play along? Why don't they deal with the fanatics with their armed guards/retinues/soldiers? I also found it hard to believe that one squire's testimony was enough to get two nobles imprisoned, and I'd expect the Tyrells to have their own guard to protect them from the fanatics.
4). I generally had no problem with the Jorah/Tyrion scene, but it didn't seem believable to me that Tyrion would know about the circumstances of Jeor Mormont's death. The Night's Watch only found out halfway through season 4 when Grenn and Edd returned with the bad news, and seeing as Tyrion was in a cell throughout that season, it seems dubious to me that he'd learn all this.
Regarding Sansa's rape, I don't have a problem with it: it was a highly disturbing scene and makes sense to the plot as a means of shattering Sansa's illusion that she's in control of her situation (and thus desperately needs to escape Winterfell) and as a means of pushing Theon further and further towards turning against Ramsay. Sansa's biggest mistake this season has been in allowing herself to be manipulated by LF, and after this ordeal, I can see her character developing a greater level of independence and distrust towards others.
For me, the best plot line hands down has been the Jon/Stannis/Wildlings arc which has developed and fleshed out a lot of characters and touched on real and complex political issues. This was lacking from episode 6 and the episode suffered for it.