Really good voice acting for a free mod.
Lots of unquie classes, each team has a unquie class instead of being re-colours like in TF2.
A lot of gamemodes.
Lovely maps and are well designed.
Achievements can sometimes give you Parrot colours and titles! Like for an example "Joe The Brave" or "Fred The Coward."
The Sniper classes are easily some of the most balanced in gaming, their attacks are effected by gravity and are very vulnerable to attacks.
Lots of maps and custom gamemodes from the community!
Easily the best free mod on steam.
Source Engine, hitboxes are awful as usual, however PVK2 has the best Hit detection of all Source Engine multiplayer games. Still it's unfair when the Skirmisher's pistol can't hit sh*t when shooting someone 1 foot infront of you while an axe slashes your head off 200 miles away.
Due to how hard it is to learn this game and how unknown this game is, the playerbase is rather small, unless a Major update comes out.
Teams can be horribly unbalanced depending which map you play on, in an area where there are lots of Pitfalls, Vikings will dominate, while more tighter areas make Knights very deadly, the only map where this doesn't happen often is Bt_Island which is one of the most played maps in the game.
Updates are slow because the Dev team is small and works on a game FOR FREE! Look at TF2, makes millions a day, the newest update either butches any weapons that are added, turns updates into cashcows like the EOTL update or don't do anything... and people wonder why I hate the TF2 devs sometimes.
Overall it's a very hard game to get into, but it's fun.