What do you think of the culture of the Alliance military?

Clearly. 

I think the Alliance is differently depicted in ME3 vs 1 and 2 that's all.

A lot of the time they forget to use the Jargon in 3, only the segments written by Patrick remembered stuff like "shore party" and "Aye aye". The rest of the writers including Mac reduced it to industry generic shit like "ETA" and "LZ" and "Foxtrot" kind of drivel... You know, shooter schlock and that is exemplified in the awful, awful into to 3 with lines like "I'm just a soldier, Anderson, I'm no politician."

Yeah but here's the thing Shepard. You WERE involved with politics you jackass. You had to go over mission results with the council and you had a hand in representing and choosing the future of the human council for christs sakes.

But by design the ORIGINAL Alliance was stated by the ME1 writers to be the representative force in the galactic society both politically and militarily. Mac Walters seemed to have forgotten that when he wrote Priority: Vancouver though.

Mass Effect 3 was just Patrick and Dombrow fighting against Mac and Casey's weird bipolar decisions I imagine. So much of the backbone of the plot seems to change direction from where 2 left off or how 1 had taken shape and then in optional dialogues or choice-alternative scenes like the other council the writers are suddenly reasonable likely because Mac only was concerned with the default main story. The original council are depicted like ignorant fools when Shepard demands help for Earth over their homeworlds. The new council questions the rationale of helping Earth the same way I did internally instead. Garrus written by Dombrow also points out Shepard is asking turians to leave their homeworld just the same as Shepard did. You can tell this is because Mac was ignorant and left the other writers forced to write for his illogical plot and all they could do was try to rationalize and handwave his decisions.

And that's the same thing for the alliance. Mass 3 wanted to be World War 2 appropriated over Mass Effect but they tried too hard to force the Alliance as the brute-force, military culture that looks like the brits in WW2 for instance. They should have appropriated the original depiction of the Alliance with their gunnery chiefs and boot camp like lingo into the theme of galactic war but instead Mac and Casey screwed up by forcing a WW2 aesthetic on it.

I think the main thing that bothers me about the Alliance is Joker. No realistic military is going to allow in people who can't all meet at least a basic level of physical fitness. A team is only as strong as its weakest member and while Joker may be a great pilot, he is a burden on those around him in an emergency in which physical ability is needed. We see this manifest twice in ME2. It's just too much for me to really accept.

I suppose another is the way Anderson can go to the turians to launch is Cerberus raid, which involves the arrest of Alliance personnel and operations in Alliance, and not have his military career ruined. Even if most of the officer corps and leadership aren't Cerberus sympathizers, Anderson made them look weak, corrupt, and incompetent. That raid would have been huge news and cost the Alliance dearly in terms of political capital. It would make sense for Anderson to have been "encouraged to retire" after that little stunt, rather than still being an active member of the service in ME3.

That's all PR and American tax dollars courtesy our greatest ally.