1) “So it wouldn’t be an understatement to say…”
So many people, including professionals on big name network new shows and newspapers ,make this gross mistake. Folk, if you don’t know the proper use of “understate” vs. “overstate” DON’T USE IT!
For example: “it woudn’t be an understatement to say he was 60 feet tall”. No, it isn’t. Because he can be 5 ft tall and the statement is correct. So, what are you trying to say? I think you meant “overstatement”.

2) “however, in the 600 years it took the colony ships to reach them, the planets have suffered some environmental cataclysm”

I haven’t played the game, so maybe this is what Bioware intended (and reveals?). Maybe the Kett invaded in last 600 (or 6?) years…
…But the physics is really this: Andromeda is 2.5M light years away. If they used any normal technology to examine these golden worlds, they are looking 2.5M years in the past. So it wouldn’t be only the last 600 years where some cataclysm may have occurred.
And they (Initiative/Bioware) should have known that before setting off. Hey, 2.5M years isn’t enough to change 7 planets’ geologies. But imagine if scopes were trained on Earth 2.5M years back so some intrepid explorers decided to come to this world without sentient life?
So this is my beef: the whole game is based on a crazy concept: Spend a kabillion $ to send people on a crap shoot based on potentially viable planets 2.5M years ago. If at least they explain it as a hedge against the Reapers, well maybe that gives it a *little* viability.

3) Multiplayer: A LOT of people love ME3’s horde-mode MP. If you look it up, you’ll find the majority of professional reviews more or less say “surprisingly fun/satisfying/excellent MP”. And many testimonials from players along the lines of “I didn’t plan to try MP, but now I’m hooked”. Having said that, I’m reading now that there are some serious issues with it, such that those same ME3 MP’rs are waiting for fixes.
I think your criticism is fine, it’s your opinion. But, at least to many, the issue is it is buggy, not the design intent (to recreate the very successful ME3 MP which is still active 5 years later).

4) “I’m not particularly adverse to more of the same (a quote so good, it should definitely be on the game box somewhere)”
Well, if they do quote it, request they change it to “averse”. Look it up.

Yeah, some snark here. But if you are going to publish, I suggest working on the bugs (apparently, just like Bioware needs to).