Leviathan scared the hell out of me. The scene with the guy smashing his head into he glass and Leviathan talking through him and all those glazed eyed people. That was pretty wicked.
I also like Captain Wasea. She took me quickly out the first time I fought her! Plus, she yells that she wants to turn my head into a "pulpy mass". I don't use subtitles, so I had no idea what the hell she was saying. I finally had to turn the subtitles on. "Pulpy mass". heh heh...it is still funny to me for some reason (But I am a dork). But seriously, she was a pretty bad-ass asari...she even had those evil looking markings that were bright pink. An admirable foe, meethinks.
I also loved all the merc leaders on Omega. "You think you can screw with the blue suns?" Hah! They were awesome!
And also that crazy woman who was using Okeer's krogans to train her mercs. Her voice over the loudpseaker was kinda cool in the background while you are trying to fight your way to Okeer.
So I guess...I really like all the merc bosses. They have alot of personality and they are fun to take out. They also have some great lines.
Pulpy mass..heh heh...
Oh...and worst are the stupid little rachni spiders. What is the point of those things? Seriously, am I a Spectre or a pest controller?
Also...Miranda's father could have been a glorious bad-guy. The build-up to him was pretty amazing, Then you get some crap dialogue and weak standoff. What a waste!! He could have easily been one of the best villains in the game!