Not a RomCom, but a RomDram, and pretty dreadful...

Rating: 3/10 (5 March 2011)

First the good: Matt Damon and Emily Blunt were very good, the NYC scenery was real and the special effects and cinematography were nice; BUT the plot was paper thin, silly and worthy only of a short sci-fi story from the fifties...
Oh, you say, it WAS based on a sci-fi short story from the fifties? Hmmm...they must have written and rewritten the screen play until they had it stretched to three hours, shot enough film for 4 hours and then finally cut it to two. At least with RomComs there are a few laughs scattered around so you're not totally bored; not so here where this movie takes itself waaaaay too seriously.
It would have made a good "Twilight Zone" back in the 1960s...Rod Serling opening and closing would have have made it better. And speaking of better, John Calvin had it pegged in the 16th century, but he wasn't silly.