I liked it simply for V's alliteration speech and dispatching of Creedy.
I think some people were expecting too much from it and tried to read some deep meaning from it, which wasn't there, so they got pissed. It's not the graphic novel, there's not enough time to cover everything that happens in the graphic novel, so what's wrong with taking it at face value as a rip-roaring daft movie based loosely on the novel?
The decision to move it to the near future instead of the 80's was probably not the best decision, but it made it more accessible to an audience unfamiliar with the comic series. It doesn't HAVE to be in the 80's, dictatorship is a constant threat...