Underworld 1 and 2 will be remembered for awakening the British to a vampire-lycan(werewolf) world. Dark backgrounds and old-style clothing with sexy kitten Kate Beckinsale. Well, most of the audience who hated the movies still remembered the lusciousness of KB.
Underworld 3 also known as Rise of the Lycans was a better take on the saga. The 3rd one was a prequel of the first and explained the obvious reason of the war between the two generations. Michael Sheen replaced K.B. as the lead, and his acting was top-notch, along with the villain played by Bill Nighy. Nighy is my favourite English actor also known for being in Underworld, Underworld: Evolution and the thriller Notes on a Scandal. Furthermore, Nighy acted the best throughout the trilogy. Rhona Mitra shared some screen space reminiscent of Beckinsale's aura in the prequel.
Underworld: Evolution 2/4.
Underworld: Rise of the Lycans 3/4.
Underworld: Awakening 3/4.