I wouldn't go as far as a rip-off because Sony hasn't really taken anything from Nintendo(let me explain)
I define a rip-off as a game that steals from another franchise from characters/character models/story/world design
in PSABR I don't see any red capped-looking plumber, some brown-colored looking ape, or some green capped warrior, and as of yet I haven't seen any map that looks like anything from the SSB world
I would definitely call it a copy-cat game, what Nintendo did with SSB hasn't been dove into, I didn't hear all this outcry(somewhat) when S-E did "Dissidia" or when NB did "Tales of VS." true there fighting style is way different then SSB or PSASBR, but they had the same goal in mind: to give their fans somewhat for a what-if scenario of seeing the most noticeable characters of their franchise to fight along side or against each other.
PSASBR seems like it will have more than just one mode, so that might be something Superbot is doing to further distance themselves apart and give their fans more to look forward to.
