I loved Louis Letterier's insanely OTT Transporter 2. A thing of beauty, the action scenes were uninterested in any silly notions of reality or laws of physics. Best of all, Letterier is one of the few directors currently working who can put an action sequence together coherently, so the viewer gets a kinetic charge from understanding the geography of the elements involved. Oliver Megaton has no such skills. His fight scenes have ADD, the director apparently having made the decision that action means shaking the camera violently from side to side.
What there is of a plot is eco-themed, with Robert Knepper (who if anything seems worryingly restrained) strong-arming the Stat (now decidedly hetero, after Letterier chose to make him gay in the last installment) into delivering a package for him whilst blackmailing a French politician.
Along for the ride is an irritating, freckled bint who the Stat falls for because the plot demands it. The chase sequences are generally average at best and the attempts at "quiet" moments or romance are as cack-handed and cheese-laden as in all of Luc Besson's action vehicles (most recent example being the appalling Liam Neeson at his daughter's birthday scene in Taken). It is worth seeing a bravura bicycle chase sequence as our bald Brit hero pursues his stolen car, however.