The combat system utilizes stealth, through what they call "Blending" (hiding in crowds of people, sitting in benches). But in main combat it is usually done in melee (hidden blades, swords, great swords, axes, etc.), range (crossbow, throwing knives, etc.). And yes there is a variety of weapons you can use!
One of my favorite features is the ability to recruit assassins of your own, which you can call to help you in fights and also stealthily killing targets for you! You can recruit them by saving them, they are usually people you see being harassed by the Borgia guards. You can also send them on missions, which gives them experience point, which you can use to upgrade and customize them. Sending them on missions can also give you money and materials which can be used for unlocking weapons and upgrades.
Overall as I've said from the start, this game is absolutely great! One of the best games I have played in my life. Oh and I almost forgot! The storyline of this series is one of best I have seen, comparable to the "Mass Effect" series (in my opinion that is)! I would definitely recommend this to anyone who likes action-adventure game, or any fan of the "Assassin's Creed" series! But if you haven't played any games from the series yet, I would advise you to play the first 2 games first. You can also learn some history on Rome and some Italian in the process. To me "Assassin's Creed Brotherhood" is the best game in the series so far, even a bit better than "Assassin's Creed Revelations" (I like to story of AC: Brotherhood better than AC: Revelations).
And now I look forward to the upcoming game in the series, "Assassin's Creed 3"! I'm sure It will be great! And that's all for my review of this game. I hope I've helped those who are planning to buy the game.
"We work in the dark to serve the light. We are Assassins. Nothing is true, everything is permitted."
~Ezio Auditore da Firenze~
Information was taken from my personal experience of playing:
-Assassin's Creed 2
-Assassin's Creed Brotherhood
-Assassin's Creed Revelations