I hear great things about Breaking Bad, and I'll allow that perhaps it belongs on the list. I just haven't seen it.
Best shows ever? There's a long list vying for that accolade. So while you wait for these shows to come back, check out one or several of these:
Rome (HBO)
Deadwood (HBO)
The Wire (HBO)
Game of Thrones (HBO)
Carnivale (HBO) Noticing a trend? LOL
Others will throw out Dexter, The Tudors, spartacus. All very fine shows I'm sure. I just haven't got around to watching them yet.
For non-pay TV, just in the last few years:
Sons of Anarchy
Justified
Rescue Me
The Shield
And I'm not even counting great and fun shows like Farscape, Firefly, BSG, etc. The point is, we're living in one of the best eras for good story telling on TV. There's loads of great stuff out there to get you through the wait. And the list will grow with each response.
Just not Lost. No way, no how. I'll spoil it for you: The last season is really just 16 episodes of the writers flipping the audience the middle finger. It took a fantastic show, and turned it into a 6 years wasted piece of trash.