Great game! Worth the purchase.
The new Adventure mode is a whole new experience with a weird but nice storyline and a lot of cool scenes. The new trophies, stickers and the mode that allows players to mess with them is a sweet new mode. As well as the tons of new modes like create your stage, and more. A lot of veteran stuff returns like characters, stages, entrances, and the gameplay is not similar but not too different from Melee's controls. (it's a mixture of Smash 64 & Melee).
Final Smashes! excellent new detail, almost every character has their own unique final smash. This game has so many great points. However on the negative side:
The wi-fi play is unnecessarily strict and lacks the power to be called great, it's very similar to Mario Kart DS except without the nickname/username being displayed. Don't worry Nintendo, a nickname does not mean a person will get kidnapped. Though Sakurai the creator of the game made the wi-fi play strict for a good reason, it might not appeal many people. However it's still fun to try, as there are many other ways to communicate through wi-fi with friends (you can send stickers to them and more).
There is still a good amount of clones in this game, many final smashes stereotype the originality of a certain series. The character representation was almost close to representing great Nintendo, but a few playables seemed like poor choices and it's those choices that don't match the originality of Nintendo. (The Assist Trophy roster proves that there were better choices to use from). However don't worry as only very few poor choices infested to be playable in Brawl, and even then it's completely optional to the player to think if or not those characters were worthy. Plus the majority of the roster is Great, it's just human nature to look at the negative sides instead,
Third parties break the tradition of Smashing with Nintendo All Stars.
Feminists might be disappointed since Samus taking off her suit is the only new playable female.
Villain supporters might also be disappointed as only very few villains managed to make it to playable ranks.
OH HOLD ON! I am not FINISHED!
Many of the great choices that were unluckily left behind still appear in this game either as trophies, stickers, Assist trophies, or all three. So in a way almost every fan of first /second party Nintendo series will be pleased.
Besides everything else in this game is fun, as it includes many new modes, stuff, and more that will make this game a whole new experience and make any person that plays it happy.