Ive played the game yesterday and its not bad, there are quite some things that I really like.
The first thing are the stages, there are a lot of stages that would never come to my mind like the a link to the past stage or the clockworktown stage. the design of the stages ( allies, items, stage hazards ) are also very sophisticated. another thing are the sprites, for some characters there quite well and the last thing are some of the final smashes. I really love the one from DK which just brings him back to his first title, where he is standing on a red steal beam and the player can choose where he throws his barrels, just awesome, the final smash from marth is also very cool ... its the same like in the other smash titles but after the final hit a life bar from the fire emblem game is appearing over the opponents head and loses all his health and the opponent is getting smashed away !!! I dont know but such small changes makes the difference and the feel of a game, all those small details which represents those characters. and by the way the black mage is a very cool character and his final smash too.
I could imagine the final smash of DK could be introduced if Cranky Kong would one day be playable in smash bros. crusade, because he is the first Donkey Kong from the arcade game.