Emm well if you want to see action, alien abductions and vampires you don't go see a biographical movie lol You have to judge the movie for what it is. Otherwise it would be like saying "Meh Shpongle is boring cause I find most music under 140BPM boring"... like that's missing the point completly lol
Anyway, as far as biographies go, the main objective is to be well-documented (this is fact, not fiction, so excuse Mr Bush for not being gang raped by zombies and rescued by a flying car during his term lol) and show the positive as well as the negative, not just be a 2-hour praisal. From that point of view I found W to be great. Of course, it made a lot more sense to watch it when it came out (in the civilized world lol), that is just at the end of his presidency.