That whole last hour was terrible. Almost ruined the game for me. Fighting to get to Robert was brilliant at first and then when you reach him (after taking down what seems like hundreds of guys) theres a pretty awesome cutscene of you talking to the king and then it cuts to you having to piss about dodging and countering until Robert shows his face and then you kill him cheaply because if you try and make the fight last a bit longer or make it entertaining he just f**king owns you. Then its more of the same as you fight more waves of enemies on the way back to the Assassin's castle and then again its just more annoying waves of enemies and then a surprisngly easy final boss.
I very much doubt I will ever put myself through playing this game in its entirety ever again. I may dabble with some of the assassination's to see if I can pull them off a bit better but other than that, f**k that.
Right now it's time for Assassin's Creed II which I have been assured is much, much better.