I read your battle report, it doesn't sound like that guy was 100% on top of his game.
Typically by the time he reaches your base he will have Hero + Ghost and will then portal in Elite Guards as they finish cooking.
If you let him get a toe hold in your base - he is there killing just buildings and you are not stoppping him - he can finish the game shortly.
Having the ability to continuously portal units to the frontline is very strong, you will get overran in no time.
By sitting there with just his PoR, not bringing units forward, wasting all his resources relying on just his PoR to win the game, he's not the brightest crayon in the box.
Nice write up though