The only reason I may get excited about ME:A is because BioWare (and Bethesda) make games I want to play. Character customization. Good gameplay. Good story. Good characters. Fair skills, level and looting system. In essence, a AAA developer that produces something (sort of) resembling an old style RPG especially for a science fiction adventure. So, my expectation is going to be, "Well, it's the only game in town. I could buy this or stop playing video games."
This is mostly true for me too. They have always been my first choice in game purchase. Love FA4 and I'm still enjoying DAi. Though there are a few others I have fun playing like Borderland, Dragon Dogma and some others, they are not in the top 5 love it game pile.
I loved ME 1,2 and 3 till the end and all of their older games (KOTOR is still my #1 game), so I'm hoping for a good game with the characters, story, custom characterization and hopefully some choices that matter and some that are just interesting personal decision choices.
But I'll probably wait till it's out and I find out what ending choices we have (Yes, I also read the ending of books before buying them unless I trust the author and ME3 messed that trust up).
Not sure I can stop playing, my husband says I have an addiction, so I would say if I decide not to buy it I'll just keep playing my old BW games that are fun and make me cry and laugh, die or live depending on choices made throughout the game and my old FA games until a new one comes out over there.