I was and still am worried that the action mode will affect the standard ME experience. I didn't like the autodialogue in the demo, and not being able to chose my responses, it made me feel well like it was an out of body experience.
Letting me chose what I say really put me in the game as MY Shepard. When I played the demo I didn't have much input when conversations came up, I was able to write if off as it was just the demo and not the finale game.
But in the back of my mind I've been getting more worried that the Action mode really affected being able to chose what I say.
I hope for the best, but I'm preparing myself for the worst, with all the leaks, and other factors, and variables, going on it's easy to see why fans are in a state of panic.
Next I think most ME fans don't really care if the game play is the best it can be right? I mean lets face it ME1 had a better story than 2 (which it should being the first part of a trilogy) but the game play was beyond awful, but we still play it and love it because the characters and lore.
When We talked to the characters and chose what we said (don't matter if it came out the same if you chose a top, middle, or bottom option) it gave us the extra sense that we were in the game and talking and making the choices.
ME2 gave us a great 2nd arch, and the characters introduced and that we talked with were among the coolest in the series, at least for me. It had a more mainstreamed shooter type game play, but it had the feel that I was still Shepard. I know some people hated and felt that ME2 didn't have enough RPG elements. It still had the conversations and depth to the characters we love, and it also felt like I was Shepard, when I chose what to say.
I'm sorry to give this long view again, but I don't do anything half @ssed. My point being Fans have good reason to be worried and some of us are more willing to just write it off until we play the game our self or longer, and others like me or hoping for the best but fear and prepare for the worst.
I would love to be able to look back at this a say "That was funny I was flipped out for nothing, BW came through and delivered what they said they would and it all turned out fine, god I was so freaked out"