People are selecting Allers I'd guess in part due to anger over the site her voice actor is affiliated with (wrote some insulting stuff about fans upset by the endings) and in part because we got Allers instead of Emily Wong.
Allers is okay as a character, but I'd much have preferred Wong, an already established character, over introducing someone new. You really shouldn't be introducing many new characters in the final part of a trilogy. It's made worse by the fact that, as Data pointed out, nothing is really done with her except an interview or two and a few lines of dialouge. No real character development, no relevance to the plot. If she was going to be in the game, Bioware could have at least had her generate a mission or two for those who opt to bring her along, maybe even something where she has to land with the squad.
But, nothing. She doesn't even interact with the crew that much, or really ever leave her room. How cool would it have been to walk into the crew deck and get to listen to her interviewing Garrus after rescuring the Primarch, Ashley after the coup attempt, or Tali after the quarian/geth missions? Nothing like that ever happens, though.
Of course, I have to wonder how willing Ash would be to talk to the press about the coup attempt, but it still would have been interesting to see Allers try.