Exactly. The player is completely detached from what is going on. There's no familiarity, no connection, and no association. Even characters like Vega are guilty of this, as the game assumes an established relationship with him.
The game should have started with Shepard preparing for his/her trial. Anderson would suggest Shepard unwind a bit before the hearing, blow off some steam, and get some fresh air so he/she is ready for what is bound to be gruelling legal mud slinging.
At this point you're given a bit of freedom to wander around an Earth based mini-hub. You can speak to a few people, maybe meet some familiar faces from the past games, and get some solid footing as to what Earth looks like. [...]
Then, I don't know, have someone suggest Shepard go to the gun range as somebody wants to meet them. There you meet Ashley/Kaiden, and he/she introduces you to Vega. Use this as a means to tutorial some basic shooting/cover mechanics against targets, or even a friendly (and cheesy) non-lethal shoot out against one of the above two.
[...]
BioWare, hire me to make your introductions because I'm awesome and better.