Been loving all the new characters.
Geth Infiltrator has replaced my Human Infiltrator as main sniper, teh hunter mode is wicked fun and letting you see hidden enemies is a huge boon.
The Asari Justicar is a monter when paired with other biotics, she has effectly replaced my Drell Adept as the partner for other biotics, the Protective bubble is great for pushing out enemies in a zone and for helping downed team mates get back up faster.
Krogan Vanguard, Super tank Extraordinaire, so much fun, being able to bash a Prime over and over without fear of the hunters, pyros and other such is great, it least my team mates pick off every mob thats surrounding me.
Batarian Sentry..... its ok I guess, I still go for the Turian.
Batarian Soldier, awesome just plain awesome, the damage bonus and extra ammo packs ar great, the armor boost and the spike attack make the character better than the regular soldier classes, although I still with it had the mobility of a human, but then I guess it would be OP.
the only one im missing now is the Geth Engineer, but from what ive seen its a great support class, the healing turret basically makes it a credit to the team, and having overload to spam is insane, I wish the Quarian had overload, still its kinda hard to top the Salarian Engi, the Decoy is pretty much the best distraction skill in all of MP.