I thought the various interplay between characters was funny and entertaining enough - especially Vince Vaughn - but even within the logic of the plot setup it's not logical. For example, how can an SUV with two people in it continue on for ten minutes of actual screen time while being attacked by cars and motorcycles driven by bad guys with heavy weapons? The husband and wife team shoot a car with a pistol, and it blows up or somebody gets hit. The attackers shoot a million rounds and nobody gets hurt, even though the SUV itself is decimated. Then they suddenly loose all their guns, and must jump onto the SUV for some hand to hand.... And it's a lot of screen time, giving me ample opportunity to wonder why I am supposed to not be annoyed.
I understand a lot of this is comic book convention - you're expected to just accept the idiocy and illogic. But that's the problem. No internal logic. And users on yahoo give it only a fairly positive evaluation. Most critics wouldn't even go that far.
I saw the director on "Charlie Rose" last night, and was struck by his rather odd hair. He looks like a middle ages Squire. His other movies are better, I think.