I'm pretty much operating under the assumption that the game is going to be a disaster, anyway.
Me too. And while I agree with you on the things you've said, I'm dealing with it in a similar fashion to how I dealt with ME3, which means avoiding spoilers and speculation for the most part. ME2 remains my favourite game, and I knew the ending of the trilogy would be ballsed-up in some way. But when it came to playing it, not knowing a word of Casey Hudson's promises, I was able to approach the game with low expectations and end up surprised to enjoy the overall experience, only very mildly disappointed at the end. With hindsight, I can understand why some people were so upset, but that wasn't my experience at the time, and in fact it was only really when I reloaded my save file and chose a different 'colour' that the potential scale of the disaster actually dawned on me. But as for that very first playthrough, I don't mind admitting that I was affected enough by the experience that while still pondering the Stargazer scene, I kinda erupted in tears when Buzz Aldrin's name appeared. I have just about one true belief irl, which is that we have to get off this rock in order to survive, and that is what we should be committing our energies and resources to. With that in mind, I find the lore of the Mass Effect universe to be an acceptable and enjoyable fantasy playground.
With regard to ME:A, avoiding speculation pains me greatly, as it means I don't get to enjoy your, let's call it interaction in the Andromeda section. Every time I've ventured over there I've ultimately ended up depressed, so the short-term lols aren't worth it. It's very surprising to me that I ended up on this side of the fence though, as ME3 remains the only multiplayer game I've ever enjoyed or been able to play for long periods.
The way I see it as a consumer is that Bioware have given me enough pleasure that I can still just about justify buying ME:A on release. With the exception of Naughty Dog games and HL3 there's nothing else I would say the same for. I'm expecting it to be a bit rubbish, but hey, you never know, they might surprise me. And I have to be honest - my PS4 is basically just gathering dust so I have to hope there'll be something worth buying reasonably soon. I'm sure UC4 will be brilliant, but it's unlikely to keep me invested beyond one or two playthroughs. I would probably be interested in The Division, but I'm concerned that the PvP part would just detract from the game for me, and besides, I won't have a working MP account on PS4 until ME:A finally drops, unless there's a spectacularly appealing PS+ game in the meantime.