Horrendous.
The Bad: pretty much everything else
Full Review: After Digimon World, I was expecting something very good from Rumble Arena. Boy was I wrong. It is fun for the first 5 battles on the outset or you first championship but soon you will have unlocked eveything and there will be nothing much to do. The finishers are loyal to the series but quite a few of the attacks have just been made up. The stages are dull, boring and repetitive and the gimmicks are too easy to just avoid. The AI can't challenge you much at all, for instance on Normal you could feasibly beat the last boss with Wormmon. I HAVE done this! In the end, you will even unlock mega-level digimon, meaning there is no incentive to actually picking one and removing all challenge from the game. While Black Wargreymon is characterisically good at wrecking alll, the rest of the game simply disappoints. One of the worst beat-em-ups ever.