CoD and BF are also not really comparable. One of them has heavy focus on vehicular combat, is way more strategic and has a much bigger scope than the other one, which is more of a fastfood like hop-in an pwn-some-noobs shooter. I let you figure out which on is which.
Brawl is point based just like PSABR is. Depending on the game mode you get points, lifes or coins when you knock your enemies out of the ring. I don't see the big difference to PSABR except for the fact that in one game you kick your enemies out of the ring and in the other you one shot kill your enemies with a special attack.
Of course there is demand for this sort of game on Sony consoles despite the fact that Nintendo games generally are looked down upon by the other consoles supporters. It's the same with LBP Karting. First step, ridicule Mario Kart. Second step, recreate Mario kart in LBP Karting. It's just hypocritical and saying that PSABR is not a rip-off is just as hypocritical. I don't have a problem with the game itself, I may even buy it to save my Vita from starvation, but it's a rip-off.