As for Monster Hunter, I keep getting different information. At first people told me that Hunter Blade and Monster Hunter are exactly the same game, they just changed the title when porting it. That's I added it as one game. Later people told me it's actually two different games and Hunter Blade is just a copy so I separated them.
I removed Monster Hunter now and just left Hunter Blade.
Fist of Fu - has been shut down
Global Agenda - Open World elements, but mostly instanced aimed.
Brawl Busters - Can't really say it's that action-ish. It's just a spammer as it doesn't require or doesn't have aim and what not.
SD Gundam Capsule Fighter - It's gameplay like GunZ / Exteel, so definitely action, but it's a lobby based game.
Cosmic Break - Isn't this the same style as Gundam? If so, then yes, action and lobby.
Face of Mankind - I would say this belongs more in the true MMOFPS genre (like PlanetSide), but instance based, as zones are isntanced.
Core Blaze - This is also gonna be action, but more in the style like RaiderZ / C9 / Vindictus, so instanced.
No clue about the other games.
You should make a 'true MMOFPS / MMOFPS-RPG' category too. Since it belongs to the Action MMO-genre in a way.
Games to add to those would be; Face of Mankind, Fallen Earth, Global Agenda,...
I'll list more whenever I can think of the other games. I'm gonna edit it in just for now.
Edit; Also gonna add a 3D + Lobby / 2D + Lobby category.
Edit 2; Isn't RaiderZ going to be instanced as well?
Diablo and so called " diablo-clone " MMORPGgames are considerate action , and are NOT like 4s because Each CLICK equal's an Hit, Or Hold to keep attacking and once finger is off the mouse it stops, where as most 4's games are click, and it auto attacks and the only manual attacking you do is spamming the 1-9 keys, not necessarily different combo's.
Using the Click per attack feels like you have more control over combat IMO where as standing still , with auto attack and pushing 1-9 keys with a cool down seems to robot for me. ( guild wars 2 will be different aswell considering its 1-9 keys, but has an action feel like )
Return of Warrior is open world, Medieval themed, Rpg. You do get alot of options in this game from healing classes, enchanting classes, to tanks, and high dps assassins and archers. It's pretty much party oriented, but it's not too bad soloing.