if your renting it from gamefly be aware that la.noire is a 3 disc game. you will only recieve one. however i found it to be a very good game. i bought it. but it is definatly worth the rent. pseudo explained the rest in his answer.
the first game was a huge hit. you can bet they are gonna make another one. jack marston is prolly gonna have his own separate story line which in term can be good and bad depending on what its about and if its related to the first game.
assasins creed is not that over rated. what might make it over rated however is this. i heard they are trying to make a new AC game every year. my guess is that its true and its slowly going to kill the game.