The crux of any Smash Bros. game has always been complexity via simplicity. i.e. Easy controls hiding mountains of hidden depth. There's an attack button, a special attack button, a jump button a block button and a grab button... and that's it. "Easy to learn, Difficult to master" is an old saying that applies perfectly here.
If this is your first delve into a Smash Bros. game then be ready love it and hate it in equal measure. You'll love it for the epic scale of the battles, the slow learning curve, the gradual understanding of the mechanics and physics of it all... but you'll hate how damn much you love it! Me and my friends have been playing the Gamecube version if this for nigh on 6 years and showed no signs of stopping save for this sequel. And this IS a sequel...
As a sequel you're already expected to be quite familiar with the controls and inner workings of the series, which can be a pain especially because (i think atleast) the difficulty has been amped up on this edition. Unlocking characters outside of The Subspace Emmisary is much harder than in Melee, due to the increased difficulty coupled with not knowing what moves they possess but this challenge also adds to the fun.
The graphics on this Smash Bros game are pretty great: bright, interesting colours; excellent animations; astounding character design and level design, you're never without something pretty to look at.
Now, I realise the Wii is a family console but this is NOT a family-friendly game. The difficulty to master the controls will put off many family members and thos that do master it will no doubt get in many an argument, however, if you've a child that loves him some Nintendo he will ADORE this.
There is Nintendo goo spewing from it's every orifice, there are hundreds of trophies to collect featuring nearly every Nintendo character from the last 25 years, a cast of 35 characters any Nintendo fan will love taking control of and LOADS of in-jokes contained in the games many, many levels.
Overall, a game no Nintendo fan should be tortured with living without.