Are there any choices made in the arrival DLC that influence ME3?
I am anxious to play ME3 but am considering playing Arrival first, but only if it will further influence things in ME3.
3 Answers
The short answer is no.
Without any spoilers, the reason is that the Arrival acts as a story bridge to ME3, but does not present any major choices; everything that happens has to happen, or else you just lose (die).
Source - Experience
Well, Anderson does mention what you did when asked why you were relieved of command. Beyond that there don't seem to be any consequences.
You lose some EMS, and the end result is accomplished by a misc. squad instead of Shepard
