I think my feelings on TVD changed in the way I watched the show. Season 2, for example, I binged in the space of about a week and I really enjoyed it, for the most part. Season 3, I watched in bits and pieces: sometimes really soon after the episodes aired in the US; sometimes after a month or so. Whether this was because of its quality or because of my viewing habits, I can't say for sure. It did leave me thinking the experience on the whole was lesser than that of season 2, but I can't really say why.
I plan to watch Revenge eventually. That also got much better feedback as it went along from some people, so I'll definitely watch it at some point.