Note: all of my ratings come from a classic mode perspective. some kits may actually work (or not work) in 1.9.
Favorites:
Iron Warrior- quick, efficient, and simple. Only factor besides skill is when you eat the apple, so i personally love this one.
Survival games- Nice that the bow is an option, but glad it is more sword focused.
OPwarrior- Simply a longer iron warrior fight, except when you eat the apple is a bigger deal.
Health- This ones really fun to play, it focuses on where you throw the potions as well as when, as you don't want to heal your opponent and want the most out of every potion.
Ninja- Its nice to play and has an interesting concept, but the lava maps are too easy to accidentally kill yourself.
Dislikes:
Eggwars- nothing special, people often climb out of the map with the blocks.
Trapper- no skill involved, its simply who gets to 4 hits first. A single combo ends the match. Wolf never gets a single hit even when used.
Hunter- just charge in with your sword. you can kill your opponent with barely any contact with the wolves if you just keep moving.
OParcher- literally impossible to die. I usually just strafe around and smack them with the bow to disorient them and break their armor. 99% of games end in a draw.
OPeggwars- again, nothing special, people often climb out of the map.
Bomber- It's a nice idea, but I hate playing it.
Mender- its ok, but the mending part is never needed as the fights are too short. Maybe up the protection and use gold swords instead.
Explosive Bow- whoever can spam bow the fastest wins. Not a fan at all.