The new season is exceeding my expectations so far. My biggest complaints about season 2 and 3 were that the terrorist threats were so big and impersonal in comparison to the first season. So this one is getting off to a good start for me.
Also, the end of season 2 seemed to be building up to something even bigger, so it was kind of disappointing when season 3 was unrelated. It would have been nice to find out what that was about. The father of the terrorist family said that they've been in the country for 4 or 5 years preparing for today, and I haven't calculated how many years in the show have passed between season 2 and 4. But I'm not sure, I'd like to see the end of season 2 again to see if this is even a possibility.
Also, I thought it was lame in seasons 2 and 3 that the day that Nina shows up is the day that Sherry also shows up to "help" the president, etc. They at least partially fixed that problem by killing off old characters last season, though.
