There's an audio (and text) review from Kenneth Turan here.
And Nathan Lee's review excerpted below.
"...moral nuance and mythic resonance, are everywhere on view in Hellboy II, a rare blockbuster with soul. Del Toro brings a meticulous artisanal attention to his material, suffusing it with uncommon subtlety and care.
And for all its comic-book gobbledygook — the plot is sheer delirious nonsense — there's a mischievous, childlike wonder to Hellboy II, a guileless belief in itself and its audience. It's a summer joyride that remembers the joy."