Wow. What a bad movie. Well, not horrible -- I'd give it 2 stars out of 5, maybe 2.5 stars if you know you're just there to watch the violence. And I wasn't expecting much, so I wasn't severely disappointed.
(I got two $10 vouchers cuz I bought the Underworld boxed set on BluRay last week, so technically I only paid $3 for my roomie and me to get into the 3D version.)
The movie was riffing on a bunch of other action pics, including Aliens and The Matrix trilogy. That didn't help. Selena seemed a lot more badass too. I guess before she was just killing lycans, who are superhumans, and so the violence seemed warranted; and she just fed on humans when she needed to; but here she was mowing through humans like grass and she just seemed pretty damned ruthless in a way she never came across as in the earlier movies.
There was quite a bit of computer generation, and much of it seemed fake -- especially when they tried to include Michael for a few seconds here and there.
I swear she dropped Wes Bentley out a window early in the movie. I have to IMDB it and see if it was him, since I didn't see his name in the credits. I thought it was funny seeing Stephen Rea here, since he's played vampires in other movies (like "Interview with the vampire").
I don't think it's worth paying full price for in the theater; but then again, in the theater you get larger than life images, surround sound, 3D (if you pay for that). But I wouldn't have gone except that I got the vouchers.
For being such a fast-paced movie, I feel like the movie didn't have as much a heart as the others, and thus it still felt kind of boring.
EDIT: Saw the 3D ads for John Carter on Mars -- again, lots of action that looks completely boring, like "Avatar 3D After Strip-Mining".
EDIT2: Rotten Tomatoes synopsis:
"There's more vapid action and less story in Underworld Awakening than previous installments, making the whole affair feel inconsequential."
Yeah. I'd agree with that basic assessment.