Needler sucks in Multiplayer. I don't know why that is. Single player it's good to use because it always follows its target and gets the job done. I'm pretty much echoing the thoughts of the previous posters, but it's so true. Hmmm......
*thinking of a logical explanation for this*
Maybe because in Multiplayer you're fighting against guys with shields and good health, and in Single you're fighting weak aliens in plentiful supply. I dunno.
*scratches head*
-oddguy