I've never heard of the tv series it's based on and while I know trailers put the best bits in but I think it's kind of scuzzy to misrepresent the type of movie you're making.
Having said that, it's worth going to see it, it's enjoyable especially if you know what you're going to see.
Mind you you could question my taste as I Just watched The Proposal and enjoyed that too. I think Sandra Bullock is great at comedy, she can do slapstick without it being over the top and ridiculous (Jim Carey take note). God help me but I love me a romantic comedy, plus naked Ryan Reynolds doesn't hurt