Probably the best game ever on the X-box 360, with fascinating dialogues and combat.
Their are many reasons why I say this is one of the best game I ever play. Your missions are not linear where you have to follow a script, you can do whatever you want and explore the vast universe before returning to your real mission. What's choices you make will determine the outcome of what happens later on in the game. The combat is amazing, with great squad coordination you can do with your two partner. Each partner equipping themselves with unique weapons and biotic powers, which is a pleasure to watch during a fire fight. Your own biotic powers are also cool to use it self. The two coolest characters you should take in almost every battle with you is Legion(A Geth armed with a Super sniper rifle) and Grunt(A hybrid Krogan with super shotgun), plus both guys have their own shields to limit their damage
Their are two downsides that wasn't really enjoyable although minor was the planet scanning, and lack of weapons. Planets scanning was very time consuming at least 10 minutes worth to completely extract mineral from a planet, which was necessary if you wanted to upgrade your weapons. The other hiccup was you don't get any new guns, but rather upgrade the existing ones to make it more stronger.
I ended up passing this game twice, and putting up almost 60 hours of play. It was that enjoyable. Definitely a must have for all.