I liked a lot of things about Woody Harrelson's Haymitch (one of my favourite added scenes was Haymitch watching the Capitol children play with swords), but I don't think he was nearly as dark as book!Haymitch. I just re-read Catching Fire and I think that's when the really dark, haunted, nasty elements of his personality come to the fore so hopefully we'll see more of that in the second film (I think Woody's capable of it).

ETA: In answer to your question, I guess you could argue that on P&R at the beginning of the season Leslie chose the "larger picture" over her relationship with Ben, and I don't think the show tried to say that it was that she just didn't love him enough... but then they got back together so it's kind of a moot point (which I don't mind, because I'm perfectly fine with Leslie Knope Having It All).