Purist are complaining about the Cat/Talisa scene. I loved it.
Whyyy?? That scene was amazing and made Catelyn more sympathetic than her book counterpart.
Totally agree.
Because they're purists. They think that the slightest deviation from the books should be punishable by death, and have no grasp of the limitations in film (i.e., budgets, conflicting opinions of writers/producers/etc.) compared to novel writing.
David Benioff (one of the executive producers/writers) is actually a very talented author in his own right, and even better, he respects the books. Many of the additions & changes made - like Arya's interchanges with Tywin, or Loras never believing that Brienne killed Renly - are improvements in my mind, yet still would have fit right into the books. Granted there were a few things that weren't handled well: Jon Snow is my favorite character in the books, but in the 2nd season he came off as a bumbling dumbass who is nervous around girls, and his true motivations for going over to the wildlings wasn't made apparent enough to the audience. I will concede though that his portrayal in the show was perhaps more realistic.
Oh, and as for Talisa, there's a very interesting theory about her, and would explain last season's loose end of why she was apprehensive about going with Robb to the Crag:
https://www.youtube.com/watch?v=jsTVnZm9hFg