I actually prefer the later seasons. Amy is possibly the best character on the show, and there are surprisingly few shows where most of the characters are already together, let alone married. It almost seems like a lot of writers completely forget how to write once a character gets married (see Spiderman or Superman). I also really like that Howard's character became more than just a desperate perv, or at least, that they did something other than that with him. Sheldon's character is getting a bit static, but I care enough about how outcomes affect other characters that it's far from turning me away from the show.