Unfortunately for 'The Lookout', the story sounded a lot more interesting when described in 'Neo-Noir' (2009, Wallflower Press). Nevertheless, this is still an above-average film, with an interesting (if occasionally predictable) story and sublime acting from the two stars.
There are other reasons. JGL is the biggest but as far as a fun crime thriller I thought it succeeded greatly. In addition the turns from Daniels and Matthew Goode are great (Goode's career becomes increasingly interested if you've seen both Watchmen and A Single Man). Correct though, it is not brilliant. Tight writing, not necessary to watch but I think should be.