In all fairness, about half of the sex scenes in the books between Jaime and Cersei could be termed rape, since, by and large, someone says 'no' at some point during it. The fact that they ultimately give in does not change the fact that it's still rape. The very first time we're exposed to it - when Bran catches them - Cersei is saying no. In the case of this one, in the sept - in front of their dead son's body - it's the same thing. Cersei says no, tries to fight him off, then gives in.
Then, on the other hand, we've got Cersei who literally says that some women deserve to be raped (which people seem to take at face value and think is okay or something idk?)
Idk. I'm not going to stop watching the show. because I enjoy it a very great deal, but at the same time, I'm rather irritated that this particular scene - which is a big deal and a major turning point in the relationship between two very important characters - has been twisted around backwards in a very OOC role reversal and is sort of fucking with the way that both Jaime and Cersei have been developing as characters in the show. Some things, I can understand - Dontos barely appearing, for example, or combining Gendry and Edric Storm - but changing pretty important stuff like this is just kind of disappointing.