I gave it a 7 out of 10. My thoughts.
I saw this yesterday (finally!) and I was entertained but not overly impressed. Mainly my issues are with the directing, this director knows nothing about slow motion usage. Also some of the fight choreography seemed off. However I still enjoyed it quite a bit, probably as much as Awakening (I scored them the same) but I'd probably re-watch this one over more than I would Awakening.
And for fun here is me ranking the Underworld films.
Rise of the Lycans
Underworld
Underworld Evolution
Underworld Blood Wars
Underworld Awakening