I gotta admit, Noob can be pretty cheap. There are a few characters in this game that it is nearly impossible to close on, namely characters like Jax, Kano and Sheeva...those who have a counter to EVERY possible form of movement and attack. Other characters do not have the ability to immediately counter everything, but these characters do. I recall facing them on the Challenge Tower to be one of the most frustrating experiences I've had with the game.
The game is very well balanced, but these few characters stand out. Even the AI spams the hell out of their moves, and it gets really frustrating to face them.