I think they need to do a complete overhaul, it's been the same old song and dance since UNS2 but with a few extra characters and some of the moves have been re done with higher quality. They should make it a legit fighting game it's way to easy, if you can play with one character you can play with any, it's to basic.
I mean I've played them since the 1st Ninja Storm where it was a 2d fighting similar to street fighter and since UNS2 they just keep releasing the same game over and over with slight additions. The AI is way to easy, even on the hardest difficulty setting it's like fighting a really sucky player online, other fighting games have harder AI's. That's why the majority of people who just start playing it think there good but get destroyed online. Really the only way to make this game challenging and to get better is to play online. The moveset commands are way to simple, I like simplicity mind you but it takes only a little skill to be really good at this game, it's mostly button mashing for the most part, it's way to simple.
Also add different move sets with different characters that have different commands for each. It's like each character really only has two abilities, and it's pretty weak. Each character should have there own moveset and commands for the moves, it's basically the same across the board with all characters. Lastly they need to add more game modes, there should be survival, time trial, etc. and they could try harder with the tournament mode, it's just walk through.
I'm not trying to shit on anyones parade or anything but, it's just getting old for me. If UNS4 has more depth to it i'll get it, but if they release another Gameboy Color fighting game forget about it. They should keep the name though.