Finally uninstalled the game off my computer. I didn't love it the first playthrough, but I was keeping it installed in the (now very unlikely) event of new DLC, but now that that's never coming I saw no reason to keep it, sadly.
The core game has so few interesting decisions that you can make that it's the first Mass Effect game I haven't wanted to play through more than once. Stuff like "Choose whether you save this one Solarian of these 3 Krogan", "save the enemy base or blow it up", or "make a military base or a scientific outpost".
Even if they are minor, not having confirmation of a sequel makes the decisions even more insignificant because we'll never get to see how they play out (since they barely matter in this game). In Mass Effect 2+3, there were a bunch of minor decisions that I wanted to see the results of, even if they were minor of not, like choosing to shoot someone or not, or throwing them out a window. Even if they didn't affect the overall plot much, they were still fun choices to make.
I think this game could have worked well with some 4X elements in it. They could have had more native alien races, and depending on you choices it effects them differently. Making a military base will scare species 1, make species 2 respect you more, but make species 3+4 angry. Or a scientific base will make species 1 an ally, species 2 see you as weak, and make species 3+4 neutral about you.