This film could've been so much better than it is if it had only taken the time to have some kind of story or character development.
As it stands, the film is visually very impressive, with great use of colour throughout, and Milla - as always - looks great in the lead role. Additionally, the sound quality is very good, especially in DD5.1 (sadly no DTS).
There is lots of interesting technology, that is never explained (like dimensional compression), and some breathtaking (CG enhanced) locations, but for the most part the frenetic direction means the viewer has little clue whats really going on, which makes it hard to connect with the main characters (Ultraviolet and Six).
However, the choreography for Kurt Wimmer's "Gun Kata" is impressive, if a little hard to follow at times.
Overall, I'd say if you like flashy looking and sounding futuristic action films that dont require to much mental commitment, then this is reasonable fare for a fiver. Just don't forget to slip you're brain into neutral when it starts...