Well, just because you and others don't like it doesn't mean it's horrible.
Personally I think it's been a pretty good season and everyone is just upset because it's not balls to the wall action, intense suspense, and it's been a deliberate slow burn obviously. From the looks of things it will start to get more intense in the final hours.
I mean let's face it, 24 has always been had slow burners even in the early seasons.
As for the scenes you mentioned? I think it was pretty evident that they knew the car was coming and they didn't expect the car to have a bomb until it was too late.
The Dana subplot was pretty bad at first, but it was no different than the subplots involving Kim where you see her going through the SAME situations despite being kidnapped, almost tortured, chased, and having her life threatened numerous times.