I think the past 2 seasons were great. A couple years ago I didn't think they could do much else to keep me interested ... AND then they brought in those oscillating cans. I thought there were awesome marvels of tech.
While the season finale was disappointing, you gotta remember reality can be exactly like that. And to me they accomplished their goal of keeping me hooked for another season.
I'm looking forward to the Big Dig if nothing else just to see it logistically executed.