They should stop putting crappy villains like the DEADLY shixs and just bring back other villains in FULL Glory not just make them Eggman's lackey. Metal Sonic should take the stage again.
I'm still waiting for a good fighting game though.
Why not both! A fighting game where Metal Sonic has secretly organized everything to reacquire everyone's data, sounds like a great idea to me! (I've honestly been wanting Metal Sonic to take center stage again as well.)