So you are being hugged to death by them faster than you can even shoot your pistol. Hence the people in Mass Effect need some sort of melee weapon to fend those off in the very close quarters. Just because your pistol in the game works against them does not mean that it also works for the countless soldiers in the game.
---------- Post added 2013-05-08 at 09:41 AM ----------
I like that line of thought with the different music genres for the Mass Effect squad Tali and Legion would be either Techno or Dubstep artists, Mordin an Opera singer, Garrus some kind of RnB or Blues singer, Jack definitely dark metal, Javik would create his own music style called Troll-rap where he would basically troll everyone in his rap songs, Zaeed would fit with hard rock or heavy metal, Kaidan would be the perfect ballad singer (he´s pretty bland too ).