Assassin's Creed may be repetitive, but that can be forgiven for all the other things it offers you.
Gameplay: Cool. The game goes around you killing high ranked templars. How to do it? Well, first, you must take a look at your background, you get to the top of selected high buildings and inspect the area. Then you gather information, this part is where I got mad a few times, you need to get 3 info. pieces, there are 6 on each city, but sometimes it's difficult to notice who is the person carrying the information; you can get info. by eavesdropping, pickpocketing, interrogating, and completing tasks. After this, you'll finally be able to do the assassination, which is pretty awesome, and you'll be relieved once you make it. The battle system is pretty easy, but when surrounded by many enemies, you'll have to pretty much counter-attack most of the time, but this is not bad, most of the time, when you counter-attack, you'll enter a quick cut-scene which is very cool and detailed. When you're not assassinating people, or recovering information, you can save civilians, get to all the view points, or get all the flags scattered through the land. This is pretty much it for the gameplay, what you'll be doing in game, it may sound repetitive, but my friend, it's an amazing ride.
Visuals: Simply outstanding. Everything looks so real, the buildings, the people (sometimes), the landscape, the effects... it's so beautifully detailed, and since it's from the Holy Land, it looks even prettier.
Sound: Great voice acting, great sound effects, and great music. It all goes well along the game.
Controls: Really easy, the combat combinations are easy to learn. The only thing is that when you run, you'll sometimes climb things you don't want to climb, but it's not a big of a problem.
Overral: Assassin's Creed is an amazing game that everybody should try. It may be repetitive, but everything else that it offers you will make up for it. The visuals are amazing, as well as the sound. The theme is just awesome, it will make alot of you want to play it, and you wont go wrong.
Go play Assassin's Creed now! It's about 15 hours long, but they're worth it.