I mean really, What on network tv right now is at all intelligent? The only shows I can think of are Lost and The Office (which may have jumped the shark already, we will see).
The recent shows on HBO have been fantastic and some of the best TV I've ever seen. Unfortunately they're all no longer in production, but we do still have DVD to see The Wire, Rome, and Deadwood. The John Adams miniseries currently airing has also been very good.

And looks like we'll be getting a new "Band of Brothers", this one focusing on the War in the Pacific, sometime in 2009. So yes, there is still good TV out there - you just need premium cable to see it.