Players like Mirallas can be absent for 80minutes then pick the ball up and either win you the game or get you back in it. It's a rare breed. Plenty of top class inconsistent players out there. Ozil a prime example.
REASON;
As pointed out by Matt, comparing Mirallas with Ozil is just plain rubbish!!!
For the record, I'm a massive Mirallas fan, but come on, Ozil is in another league! (not literally)