Personally, I feel that Sesame Street has really been declining in quality since Season 46, especially as there was a huge change in direction for the show during that time. The street stories are not as engaging to watch anymore, and I do miss many of the cast members and performers who are no longer on the show, including Alison Bartlett, Desiree Casado, Steve Whitmire, Roscoe Orman, and Emilio Delgado. In addition, there is not any humor left in the show at this point, and so many of the Muppet characters have been sidelined, while Elmo in particular has been pushed even more excessively during recent years.
Even though there were also format changes during Season 33 and Season 40, I was still able to adjust to them, and continue to enjoy watching the show. However, with all of the changes that have happened since Season 46, I hardly even recognize it as the same show I knew growing up.