Now I have no problem with new characters if they are written well. However I would like them to use bad guys from the comics. Hell I would also like to see some of the heros from the comics. Maybe not the main Avengers cause of the star's shooting schedules but maybe those we have not seen on the screen yet.
Maybe throw the guys in it:
Good Guys: Machine Man, Wonder Man, Grim Reaper, MoonStone, Nomad, Darkhawk.