@TN You should give it a try, it's great fun.
@Mystery The character interaction is a definite big thing for me because I love how lifelike the characters are and how much I grow to like them as I continue to play. For number two, I was desperate to ensure that, well, you know, the end played out the appropriate way.
For characters, I like Joker because he's hilarious, Liara (my primary romance partner for my FemShep), Kelly (whom I love) and Jack. I've honestly loved all the squad members I received throughout the game because they each added something to the table. I'd say my least favorite was Kaidan from number one, but that wasn't due to his persona.
Credits, Sodo.