So you don't like Avatar TLA? But yea, Nick is shit.I will give Smash this much credit at least..... it has characters and properties I like. The Nickelodeon thing might be a turn off simply because I don't like Nickelodeon all that much. Warner I'm not sure about, but even if it has vintage characters I'm sure it would have them in the form of some crap modern reinvention.
Also, yea just having a crossover fighting game is a challenge, especially with licensed characters. In order to make a good licensed crossover fighting game, you need to actually understand what made fighting games tick.