^ this is how a feedback should look like, when you're starting such topics, not some random rants that you are beaten by x or y (so nerf them) or that your character needs a "buff" because why not, it's free to ask for - be sure that they are ignored. So, take notes from this guy.
About DL - It is indeed true that DL still overperforms in PvP at the current stage even after the latest nerfs from previous stage and for sure will be looked into again on the next stage patch.
About BK - if people can't do 2-3 combos in a row, the character is a waste. If people can do 2-3 combos in a row (which sadly very few of current BK players can do it) they are ... hard to win against. BK is a character where mistakes can't happen (outside of bad rng of the combo hit-rate) if you want to get its full potential, even 1 missed combo can cost you your death. It is indeed the hardest character to play, gear & level, but it pays off a lot if you can master it, especially on team vs team events where buffs transforms it in a monster, hard to kill and hard to stay in its range.
About VRF - It is the easiest to play melee character from the game, that does have DPS, gap closer & ice chance on a single skill (chain drive), compared to SMG which does use 3 different skills (cyclone - gap closer, ice skill - ice, fireslash - DPS) or BK that has to master its combo skills. Apart from this reason that it is too easy to play, he's biggest weakness for PvP is that he is fully depended on having cape level 3 (which is a huge upgrade from the level 2 cape, compared to rest of classes). More than that, he's the only melee that scales into mid-late game due to skill damage % on chain instead of the pure, constant damage of SMG/BK.