I just started playing Assassins Creed, Unity. It bills a minimum processor at I5 and maximum, I7. I have an Intel Q9400 dual quad core processor with an NVIDIA GTX 660. The game lists at least a 680. So far I have experienced very choppy play, but I got rid of that choppiness by turning down the X and Y mouse sensitivity to as low as it goes and also disabling the vibration mode. With the choppiness solved, I find that the new game is much harder to play than previous AC games. It has a high learning curve, since your character is completely green and only has some rudimentary sword fighting skills. Prepare to get cut down in the streets quite often until your skills can improve. You also must buy these skills with something called Helix credits, which are quite scarce.
The climbing skills are still there, provided you map the proper keys to do the sprinting and jumping. Your character also can't just jump off a building. In some cases, when trying to escape bad guys, you are left hugging a wall. I was running along the wall and stopped dead in my tracks, discovering that my feet had disappeared into the floor. Luckily, I wasn't being chased, but it meant restarting the game all over and losing progress. There appear to be a few bugs, which haven't been properly patched out, but then again the game is s new yet, having just been released November 11.
The map sequence in this game is horrible. Talk about utter confusion and constantly necessitating having to enlarge the map to see where you are. Nothing is labeled, which means you have to go into the legend to figure out what the icons mean.
In all perspective, though, this game has a lot to do in it, just on side missions alone. I would expect that I could get lost in this game for over a year and never quite finish everything that it is possible to do.