I got a turian sentinel in a spectre pack and maxed out overload and warp, so I can take out shields and weaken armour on a whim. I also, much to my surprise, got the N7 shotgun in a Spectre pack. I did not think the Collector's Edition weapons were in multiplayer, so it was a pleasant surprise (I am yet to use the shotgun, though I'll probably give it to my Krogan soldier next time I'm playing).