After playing Smash DX, I expected much better
Dairantou Smash Brothers X definitely is no comparison to the superior Dairantou Smash Brothers DX for Gamecube. When I first got this game in the United States titled Super Smash Brothers Brawl, I was so excited, but quickly disappointed due to many things. To start with, characters were removed, the stage builder was very limited, the music remixes were pretty bad (out of 250 songs, I like 20 of them at most), and the difficulty was just unnecessary.
To be fair, this game is really quite good, but if you worshiped Super Smash Brother Melee on Gamecube, you will be left very disappointed. This game is highly recommended to those first starting out in the Smash Brothers series, or just not have yet played Super Smash Brothers Melee. With all this said, the only fair way I can review this game (since it can go either way), I will just be very direct using a like / dislike system.
Likes:
-Additional characters
-Stage builder
-Sonic The Hedgehog (finally)
-In depth story mode (Sub-space Emissary)
-Rayquaza from Pokemon is a boss
-Kirby music
-Being able to use the Gamecube controller (compatibles are Classic Controller, Wii-Chuck, Wii-mote, and Gamecube)
-Return of HYRULE TEMPLE stage
-Luigi recieves upgrade
-Kirby gets slight upgrade
-Addition of Meta Knight
-Online playability
-Challenge system even though sometimes annoying
-Graphics are spectacular
-You can do coop mode in every mode of the game (2-players in homerun contest, event match, adventure, target test, everything)
-ROB the robot enters the fight
Dislikes
-Removal of Roy
-Removal of Mewtwo
-Removal of Pichu
-Removal of Dr. Mario
-Removal of Young Link
-Severe change of Falco
-Severe downgrade / change of Ganondorf
-Severe downgrade of Princess Peach
-Graphic change of Ganondorf
-Graphic change of Fox
-Graphic change of Falco
-Change in Mario's Down+B move
-Addition of Pikmin & Olimar
-Addition of Lucario (wouldn't mind it if he did not replace Mewtwo)
-Addition of Snake (not a Nintendo character!!!!)
-Krystal from Star Fox did not make the cut
-Mega Man did not make the cut
-Dixie Kong did not make the cut
-Shadow The Hedgehog did not make the cut (not even a different costume)
-Zero Suit Samus and Samus not being seperate characters
-Combining Lizardon, Zenigame, and Fushigisou (Charizard, Squirtle, and Ivysaur)
-The difficulty is super-biased against the player
-The computers never fight each other, they always fight players
-1 hit KO moves are so cheap (usually Smash Balls)
-Smash Balls
-Only 5 Target Smash stages instead of everyone having their own
-Online gameplay feels like 1 second delays with every command
-Unlocking game music
-Many aspects of the game are way too random
-Fire Emblem Castle is 3 stages that transform one after the other instead of picking different levels
-Having Mushroomy Kingdom stage randomly be the underground stage 2 or above ground stage 1
-Almost every single stage moves
-Trophy table game
-Claiming to remove clone characters where Lucas (a new comer) is nothing more than a better version of Ness
-Name entry system is like a phone (very bad idea)
-Does not read SDHC cards
-Battling Ridley from Metroid as 2 bosses
-Porky from Earthbound / Mother as a boss
-Marx from Kirby should have been a boss, but wasn't
-Randomly being forced to fight Crazy Hand in Classic mode (there is no pattern wahtsoever)
-Assist trophies are the same thing as Pokeballs
-Goldeen is still the most common Pokemon you get from Pokeballs
-Computer players beat you up, then walk away while you chase and try to attack them
These are just some things I wanted to point out. I have commonly wanted to ship this game back to Nintendo and say try again because of all the things that I really felt they messed up on. But to be fair, it is a good fighting game and will take you at least 20 hours of gameplay to beat everything except getting all the challenges. So the bottom line is, Dairantou Smash Brothers X is an OK game, but is definitely no comparison for Dairantou Smash Brothers DX for Gamecube.
No Japanese needed to play this game, it's easy to figure it out.
Japan 
