A blu ray review rather than a movie(s) review!!!
P/Q is good for all 3 films and gradually increases VERY slightly with each new release, however be aware that these are very dark films using nearly exclusively night shots so there will be inevitable grain on all discs, but don't let this put you off as it adds to the atmospherics anyway!!!
A/Q is decent on underworld & underworld evolution although they are not HD Codec (note: The cases state that they are encoded with dolby digital and strangely enough so do the on screen menus, however it is actually dts running at 1.5mbps!!!) Rise of the lycans however does come with a dolby trueHD codec and the difference, although not massively, is better and is a shame the first 2 films in the trilogy were not treated to it!!!
I would def recommend as an upgrade over DVDs with the extended version of underworld 1, better P/Q by far and much better than average audio!!!