You are critisizing a PC shooter for not supporting a controller? Drink your wine on the rocks and mixed with coke too?
ME1 sets the stage. Introduces the galaxy, the premises of stellar travel, the politics and the tone. And then, once the status quo is defined, it changes the premises in a way which has weight because it has immersed you in the first fantasy.
Whoaaaa.
ME2 is a middle episode. Polished gameplay, and still without the long cinematics and longwinded dialogs of ME3. It doesn't really progress the story much though, the characters provide motivation and carry the game. Might be the smoothest flowing game of the three.
ME3 wraps up the trilogy and brings closure. In terms of story telling, this tends to be satisfying. IMO the game is marred not only by the ending, but also by the long scripted sequences. Still, it has its memorable moments, such as the prayer for Thane on his death bed - that turns out to be for Shepard. And there are other.
Overall though, ME1 is my favourite. In how it sets the stage and opens up the galaxy for the player, followed by how it then directs the narrative. Inventory system sucks before you realize that you can prune it mercylessly. Mako mountain climbing sucks until you realize that it is mostly redundant and skippable. Beauty marks.
ME1 presents a setting, and when asked if you care, you answer - "Yes. Yes I care."
Which is exactly where Andromeda fails. It never really motivates you to run all those errands, so when some space goon goes on and on about his unhappy childhood, or the umpteenth time you need to blast off from a planet in your Tempest,
in order to be able to read your e-mail, at some point you will just realize that you're not enjoying yourself.