I remember teen-me liking this a lot more than middle-age me does. I couldn't appreciate the art style at all this time round and - in agreement with David Lloyd's Introduction - thought the early chapters were not so good - if you can call nearly the whole first half "the early chapters." It got interesting when Evey got "imprisoned." The psychology of Evey and V's relationship then became fascinating and was really what pulled me through the remainder. I couldn't care less about anybody else.
The politics seem naive - it's all very well to say you have to destroy the despotic and fascist rulers and their power structures in order to create something better but examine history to see what happens after you succeed in that: take the Paris Commune as an example. There's no guarantee that the replacement will be any different or any better. Prevention is better than cure in these matters.
I also didn't seem to notice back then how V seems able to magically do anything he wants without ever receiving any explanation as to how, beyond his access to Fate -which in turn is never explained or justified.