Wasn't broken in the traditional definition of a broken game per say but it was made
way too passive for the casual players, and yes it being a Wii game released during the height of the Wii's popularity this should have been expected. Still enjoyable just not as challenging to master as Melee while still being easy for casuals to play.
I love the changes Project M made making it more like Melee but still accessible. Just like, well...Melee, lol.