Boring after the first 30 minutes, definitely not worth the price!
• kill a number of people
• beating up people to extract information and then kill them
• escort "brothers" killing people in their way
• pickpocket letters
• eavesdrop
• race jump across the roofs
After the first two missions, this becomes really boring and annoying, because every mission is basically the same, including the same voices, even the same phrases of what they say. In every city there is always a number of citizens you can "rescue" by killing at least 5 but more often 10, 20 or more people. Most of these rescue cases are poor women and it remains a mystery why all the soldiers of every army would constantly accuse poor, ugly old women of steeling all over the city. There are a few men you can rescue too - but it is the same with them every time.
There will always be plenty of people to kill in your way: all aggressive soldiers hating you and with just the one goal of killing you; other than that, they don't seem to have anything else to do.
The cities are really amazing, the graphics are stunning and the voice actors have done a great job. A wasted effort, though, because the game itself is completely hollow, no surprises, no humor, just a constant hack and slash with no particular challenges either.
If an alien race would classify us by our computer games, it would have to conclude that we are one stupid, blood-thirsty, brutal bunch of killers with no other goal but to kill everybody else and Assassin's Creed makes exactly that point!