I love Till The World Ends, How I Roll and I Wanna Go. But personally i don't really use HIAM, and its dubstep infuence is EXTREMELY EXTREMELY OVERRATED.
7. there are amazing songs on it (Inside Out, He About To Lose Me, Hold It Against Me) and some really bad (Trouble For Me, Big Fat Bass, Don't Keep Me Waiting, Seal It With A Kiss)