The concept of "6Days/7Nights" - a NY advertising executive and an older south seas "bush pilot" hate each other, get stranded on an unhabited island, encounter bad guys, have to cooperate to get off the island, then somehow throw off all constraints to fall in love and start new lives together - is simple but not unlike the many Cary Grant movies. With the right actors and direction this could have been a nice romantic comedy.
HOWEVER -- Ann Heche, with her nasal delivery of lines, her combatant attitude, just doesn't come off as a love interest of anyone, much less Harrison Ford. Almost anyone would have been better. Plus, Ford is not up to his usual quality, probably because he too knew it was going to be a bad movie.
The movie starts as an obvious romantic comedy. Then, during the second half crooks show up, you see a man murdered and dumped into the sea, and the main characters are shot at with machine guns! What gives? This is very bad movie-making.
I actually saw this movie twice, last night on my free DVD, just to see if I was too harsh the first time. NO! It really is a very bad movie. "4" of "10" is being very generous, but it does have a good surround sound track.
Please, see it if you haven't, just to see how a good concept and Harrison Ford can still result in movie trash.