I really liked the first Unreal, and I have the expansion that I have to tackle sometime, but the graphics in Unreal II look even more wicked than UT2003, so I can't wait for the single player aspect. Multi-player is good but shooting the same people without a focus on an adventure aspect leaves a bit to desire.
I think Unreal II will be kick ass if they can put it out soon in 03 (it has been pushed back several times cause it was originally supposed to come out this fall or around the holidays).