I agree with this post. There really isn't anything wrong with Pinkie this season- this seems more like a thread made to pick apart what people don't like about certain things that happened with Pinkie in season 3.
Pinkie has had a lot of character development over the series, but at her core she is a happy, fun-loving pony. She is going to make bad puns and jokes that not everybody likes, because that is what we have come to expect from her. In episodes where she is not the center, she is going to have one-liners and gags that are used just for comedic effect. When she is the center, you see other sides of her, for instance Party of One. It's the same as any other pony- Sleepless in Ponyville was centered around RD and Scoot, but Rarity had Sweetie Belle pulling the carriage for some laughs. It showed Rartiy's diva side and made her one-dimensional, but we know from episodes centered around Rarity that that isn't the case and isn't her character. Same with pinkie. Just because of a bad lettuce joke, it doesn't mean they are ruining her character.