You are right, in a way, but what you said would be true for at least ninety-nine percent of the television shows nowadays. Unless we're talking about Lost, that shows some promise while starting to soon become lost into its very own maze (it's hard not to make the joke). The original CSI, for example, with its two spin-offs, well, what to say? It's the same formula repeated ad aeternum. Same for The Sex and the City, if you add some futility and a considerable amount of delusions of grandeur. Or Desperate Housewives. Or NCIS. Or E.R.. Or Dexter. Even great series like X-Files or The Simpsons fall into the old boring spin cycle rather quickly - although The Simpsons are rather hectic, to be honest (which is good).
Nowadays, my favourite TV shows are House and Bones, and mostly for one reason: the cast. Bones has, in my opinion, the best cast in a TV show nowadays - there is pure chemical reactions in there, everything just falls into place perfectly. And House, well, House has House, arguably the most interesting character in TV in the last decade (not that I've followed that much, truth be told). Of course, I have two additional reasons to watch the show - Olivia Wilde and Jennifer Morrison (Lisa Edelstein is not really my type) -, but still: the show works. It's rather well written - not a masterpiece, by any means, but solid enough. It includes a lot of medical jargon without boring ourselves to death. It has decent character development. It has dull moments, yes - I remember the "villain" in the third season, and it was really a pain in the ass to watch -, but it also has many witty moments. And humour. Sounds good enough for me - way better than Grey's Anatomy, for which I never had the patience, or Scrubs, which not silly enough to be funny, but silly enough to be plain stupid. Oh well.