I am also uneasy about how Millar approaches his subject. It started with his take on the Authority, which took Ellis' driven, angry people who wanted to make the world a better place, rules and regulations be damned into self-absorbed wisecracking clowns who revel in their power and seek the public's adoration. And all this without the slightest hint of irony (that I was able to detect).
I've always been surprised that Ellis's Authority was a big deal at all - the series didn't stand out from typical *yawn* superhero comics until Millar's first arc.
And hey, he's a total liberal, who wrote speeches for the Scottish Labour Party, and happens to be a Catholic, but still writes some of the most sick comics scenes you're likely to read in a mainstream title (see Nemesis).
With Miller, it's clear that something was severed in his brain when he saw the towers fall. Keep that in mind when evaluating his work (and actions/statements) since 2001, and in not re-evaluating his work pre-2001.