I liked the ending choice thing and that there wasn´t fireworks or any huge boss battle that makes my head hurt, that the game itself was the ride and the point in the end that you choose of three different options how you end it. I chose the first one from the left (try not to include much spoilers here) and actully a little regret it.

But back to the topic. Seriosly there isn´t a game that you can´t finish during the weekend, unless it´s a JRPG like Final Fantasy where most of the time you level up.

But you should understand that there isn´t a new game out there that isn´t much longer in story, you have to find other ways to get the length of the game, like in oblivion the side missions, and in Fable the side missions and gargoyles etc.

Oblivion can be completed in on weekend also, and D May Cry in 6 hours. I´m surprised that you played more than 10h on a weekend though. Maybe when you´re playing the next game you should play it a couble of hours a day so it lasts
Oh, and why not start over and make different decisions in the game. That´s what I´m doing when the patch arrives.