Gaming Lounge

[Lemonray]

it's annoying to have an attack delay

I don't mind the delay of the whip.
Melee weapon attacks in games almost always have noticeable delays of some length. Of course having too much of a delay is a huge issue but I think the Vampire Killer's delay is perfectly acceptable, especially considering how long the whip is (When fully upgraded) compared to say, Link's sword.
Once you get the feel of the whip (It's not exactly the same in all the games, for example in any given title it might be longer relative to the size of the player's sprite, and may or may not be capable of hitting enemies behind the player at the start of the whipping animation. It might have one, or two, or eight different directions of attack, and most of the games from SCV4 onwards have let you move the whip around by holding the button and messing with the d-pad) you should be able to use it well.