While the ending was anti-climactic, all the cat and mouse stalking, watching our plucky hero trying to persevere against that Latino Terminator and the very grounded and well done action sequences (all without music, using silence to really boost the tension) was extremely compelling. And Tommy Lee's attempts at poignancy weren't too obtrusive but they could have been blended better with the rest of the film.
We go from edge of the seat tension as hero and villain are mere meters away from each other to watching Tommy Lee sit in a diner, waxing poetic about the chaos and futility of life. I guess the themes of both elements coincided but it was just a bit strange and could have been handled better. Though, as I said, this never got in the way of the truly excellent elements of the film.