*Spoilers* If you do not want to read this then don't
I have beaten the game and I can say that it is definitely worth buying for 90% or the game. The ending fell way short of what was expected so Bio-ware is remaking it to fill in the story line gaps and just answer so many questions. As for Tali no they don't really show her face, there is a way to play through that you get a picture I believe of her face but it is hard to make out. Lastly the multiplayer is beast, it is also cool that the charter that you level up will be able to become part of the campaign play through that you are currently playing, though the character isn't playable by you. It just becomes part of you total score to help save the Universe.