But back to the list,
I thought Rise of the Lycans was decent. It covered pretty much just the story that was briefly told in the first Underworld. But I found it to be good enough.
And I really liked Terminator Salvation. Maybe I just have low requirements when it comes to some movie styles... There are nits that can be picked, for sure, but they don't stop me from digging the movie.
I haven't seen a lot of them (the horror genre seems to be over representin') besides those two, so I'd say prequels are batting about 300... which frankly isn't too far off of sequels. For me personally.
Mostly....
From time to time.