I wouldn't call it 'deep' but it is multi-dimensional. I'm kind of hoping for an alternate ending... like with I Am Legend that was actually better than the theatrical version.
Spoiler:
Something like when he's rowing out to alcatraz... he gets there and there is nobody there, it was all in his head. I think that would be a great way to end. Him being 'blind' the whole time REALLY puts that cheezy-superhero (anybody see that movie daredevil?) spin on the whole film. Keep it as action/drama and within the realm of possibility. Also, anyone catch the K-mart nametag?