Yeah, I like the melee-oriented characters but I'm not very keen on biotics, so I think the last time I played Vanguard or Adept was when I played as the N7 Fury a couple of months back.
Also, biotics spam their shit, which leads to excessive screen shake and I can't aim at anything whatsoever, fuck off
edit: Also, buying SimCity lead me to get Battlefield 3 for free, which lead me to spontaneously unlock the Battlefield 3 Soldier. Whaddayaknow, lol. It's not actually too bad compared to the newer characters, but Carnage has had mixed results in the games I've played. It's wierd, sometimes it'll 1hko enemies and other times it'll barely do a bar of damage. It detonates tech combos nicely but it has a very poor, short window of combo setup. Adrenaline rush is
okay but there's a reason not a lot of characters have it; it's a very vanilla ability with somewhat prohibitive cooldowns unless you level 6 with the fire-additional-ability (which basically means fire off your Carnage while buffed, since the other skill is Frag Grenade).
I'm really not a grenades sort of person, at all. Generally if there's a grenade option I'll usually just max out everything else.
The only exceptions I've made for so far are for the Turian Ghost and Alliance AI Infiltrator, but those have been durability/damage buffs rather than actual offensive options, which stacks much more nicely and affects all my other skills/weapons.
And to boot, I really like the Turian/AI Infiltrators because the Tactical Cloak is very novel in buffing something other than sniper rifles (Assault Rifles and Shotguns, respectively).