Glad you watched it and liked it! I see where you're coming from for sure. lt gets almost defiantly ambiguous towards the end, and the characters are seemingly wandering through most of the film (which happens to be appropriate), but at least for me, it's all forgivable due to how good Foster and Harrelson are together.
Please post your thoughts on The Hunt after you've watched it! There's a lot to chew on in that movie, and I think you'll be just as engaged by that one if not more so...