I think the episode was definitely one of the best episodes ever! I laughed at nearly every scene and the "Thor and Dr. Jones" scenes are just comedy gold, i laughed the whole time and Stuart saying "Play something we can dance to" was just the best finale line i could imagine for the episode. Honestly, i think most people just think "hey it's season 9, season 9 is nothing against s2 so the episode has to be bad" that sucks so much, i agree season 9 had a few episodes that weren't that good but episodes like this make it good. Also the scenes when Sheldon acts like it's 2003 were really funny! The same with Two and a Half Men, if you remember everyone hated the last 4 seasons with Alan as the main character, but most of the episodes were still really funny and Walden + Alan was a good combination in my opinion, so yeah as i said, it's just unfair most late seasons of TV shows get undeserved hate.