It's SATIRE people!
If you don't know David Wain and the style of films/shows he creates, you may be looking at this film all wrong. After reading some threads on here, some people are definitely out of the loop. This is very much a parody/satire on romcoms. If you don't know David Wain, check out "Wet Hot American Summer", "Wanderlust", or even "Childrens Hospital" from Adult Swim. They will give you a good idea of what to expect with this film.
Consider this a warning, if anything. I know some people will go into this film expecting just another romcom. Those elements will be there, but stamped with hardcore satire and slapstick. In the trailer alone, characters are pointing out the types of cliche characters they are. They're LITERALLY saying their personalities aloud.
For those who are fans of Wain... you excited? I know I am!