legend of legaia
Let's see...
RPG: Star Ocean series, whatever Tales games I played, Valkyrie Profile series, Disgaea series, FFX-2, FFXII.
I would put Persona/SMT here but I like those for the story more than gameplay, LO, Shadow Hearts and Grandia would go here, but those are nostalgia/story based more than gameplay.
Action: DMC series (cept 2), Ace Combat series, Metal Gear Solid 3 + 4 (love messing around with different guns, infinite ammo and stealth), ZoE 2, Parasite Eve 1/2 (1 might be more of an RPG, though not getting into it with BRP in the topic).
Fighting: Soul Calibur 2, Street Fighter series, SSBM.
All I care to remember at 3am, but I loved playing those games.
Tetris attack.
Best puzzle game ever.
Worms Armageddon is up there and I loved FFXI's job system and PSO's combat system.
I really enjoy 3D action adventure platforming type games. Beyond Good and Evil, Ratchet and Clank, Jak and Daxter are the series/game that stand out the most as games I probably will never get tired of playing.
I occasionally enjoy the 2D ones as well, Megaman, Metroid, Castlevania, but I grow tired of them more easily. I'm really not sure why though, maybe I see 2D ones as maze like, whereas 3D ones give an illusion of freedom.
A lot of people have said they enjoyed FFXII's battle system, while I personally hated it due to the fact the gambit system made the game play itself at times and I absolutely HATED the fact you could see every enemy on screen, it sort of took away the random battle experience that you got with other FF games.
I would love to hear why the people who liked FFXII's system think so, just so I can see the other side of the argument.
RPG: FF7, I love the different materia combinations/tricks, if only mobs were stronger...
Action: DMC and ZoE2
Game didn't really play itself for me. Gambit system was useful but I frequently found myself switching characters and input commands manually(I went for after basically every strong monster in the game, including Yiazmat). Its battle system as a whole was much more strategic and better than the old Dragon Quest formula. After FFXII I simply can't enjoy the traditional, slow, boring battle systems anymore.
Because it broke free of random battles, while still offering a comparable fighting experience, while also adding in 3d movement to the generic RPG style fighting. Sure, you can argue gambits make it easy, but that's only an option in the game. If you wanted to go to a more traditional fighting system you had the option to not use gambits and to put in a wait whenever you selected someones menu/name. It still had the spells, the turn-based (though in a very "active" battle system) aspect and the look and feel of FF.
To try and summarized, it offered most of the consistencies throughout the FF games battle systems without the annoyance of random battles.
Star ocean 3's battle system was awesome. Makes battles less boring.
Puzzle: The Riven Myst series because those puzzles were absolutely incredible, down to the RL notebooks and having to solve things in the mind along with the game. It was such a multi-dimensional system I think ahead of its time.
Action/climbing/use of actual game environment for gameplay: Prince of Persia series. I liked how things were real in the sense of usability and depth.
Triple Triad the most addicting game in a final fantasy
snes tetris attack
ps1 puzzle fighter
Yeah, I found the Materia system to be fantastic, one of my favourites in any FF game.
I was tempted to say VIII's junction system, but after playing a low-level game I've realised how bloody broken it is.
I almost forgot about the Skate series. The analogue stick for board control/tricks was a fantastic choice and really adds a whole new level to the game.
Flows way better than THPS button combos.
Battle systems: Suikoden/Talesof/StarOcean/ShadowHearts.
Also: Cooking mini-game from Suikoden2. So simple yet so addicting.
Junction system is broken early on if you know how to abuse card mode/refining items, since you get spells way earlier than they really expect you to. Once you get further into the game though it's not broken unless, as you said, you avoid EXP so you're "underleveled".
I love playing Shining Force because of the battle system. It's heinously simple, but I don't care. I get so much pleasure out of playing that game, even if most of the time I'm thinking to myself that it's so bad, hahah.
Definitely Knights in the Nightmare's battle system. Quite simply, I've never played anything like it, and once I got the hang of it, it was fascinating. It's part realtime strat-RPG (character management, equipment and leveling up) combined with SHMUP type elements (your wisp is constantly dodging enemy fire and collecting gem thingys that enemies drop), and finally a puzzle aspect (you have a certain amount of turns to win, plus a certain amount of "time" per turn, and extra things on screen besides just enemies, like breakable objects and treasure chests. Even your units only move and attack in certain ways so you can't just send them on mobs without planning). The game itself doesn't even have a defined label to it because of this, so I can't really call it an RPG, but I call it awesome nontheless.