Have you played the game though?
From my experience, the game is very different in the areas that matter when it comes to differentiating it from other games in it's type.
Would you say that Halo looks and plays like CoD or Half Life? Or that Gears of War looks and plays like Uncharted? Of course not. They occupy a similar genre, and utilize the third person shooter mechanic, but they are very different in the game play fundamentals and overall tone and feel of the game.
PBR and Smash are the same. They occupy the same genre. No one is denying that PBR is, on the surface, very similar to Smash, but at the end of the day, the games play fundamentally different, and until you actually get the game in your hands and realize that first hand, you will continue to be like every one else who have their heads in the sand about the differences in the game that set them apart.
A video game is more than just the genre it's in. If a game isn't defined by it's rules, then what it is? What sets Monopoly apart from Clue, or Candyland, or Life? They're both board games, so they can't be different, right? The RULES, are what sets them apart.
The rules of PBR and Smash are different. Both sets of rules are fun (in the same way that Monopoly and Life have different rules, but are both fun, and for different reasons). In the end, that's what matters more than just aesthetic similarities.
Also, the physics and controls are VERY different between the two. Anyone that's played both can attest to this. You're wrong about the game being a rip off. I know you'd like to think that you're right about this, but you honestly have no sort of information to base this opinion off of besides screens and videos. Unless of course you've played the game. If you have, then please, tell me why you think both games are the same. I honestly want to know this from someone who has played both.
Check out the beta thread if you are really curious about what people that have played the game think about it. It's changed a lot of minds (both positive and negative) of people that went into the game with a "this is just like Smash" mentality.
Some people like that it's different. Some people are disappointed that it's different. But at least they've played the game and have formed that opinion on experience.
For the empht time, YES, i have played it. I am aware of the diferences and still I think its a rip off. Less fun at that too.