This review may contain spoilers. I can handle the truth.
Tries to emulate classic romantic dramas without seeming to understand them. Or what makes them work. Flat characters whose lack of depth makes their decisionmaking impossible to relate to. Except for "Well, I guess that's what the cliché version of someone of that age and that gender who looks like that would do or say in a situation like that..." Gets frustrating after a while. The tonal inconsistency doesn't help either. Can't decide if it wants to be cartoonish or…
Felt a little weird how the german parts were cast. For a movie this serious/untrashy.
Also, the fact, that both Germans and British, or whoever they pose to be, all speak English some with a cartoonish accent, some not, can get pretty confusing at times.
Great and clever movie, though. Especially loved how the movie starts right where the (very cleverly thoughout and, concerning this movie, one and only) mission starts and ends right where the mission ends.