Some of the new stuff is pretty cool. Playing as Meta Knight is awesome, but it's too bad they didn't take the time to design a whole new game for him. Instead you just play as him throughout all the levels of each game...which is kind of silly for the Great Cave Offensive and Milky Way Wishes levels, which emphasize exploration. Running through those stages as fast as you can is just kind of weird to me.
Oh, and The True Arena is a BITCH! I kept dying on the second to the last boss, but then finally succeeded but had half health left and died on the very final one and was so frustrated. But I fired it up immediately and went through and died a couple more times...but then I finally defeated the second to last boss, AND had a whole lot of health. To top it all off, there was a rock ability just before the final boss fight, which rendered my INVINCIBLE. The final boss fight took for-freaking-ever, but at least I finished it.
Got 100% but there's an open movie space. Apparently it's Video 00 or something, and I have to get it by beating Helper to Hero with every character.