The Halfling
Explorer
Interesting...from what I saw, the Essentials fighters freed the player in ways that Core rules didn't.
Suppose one wanted to play a knight that had high charisma (leader in battle, etc.). The player could take the "melee training" feat, and have attacks and damage based on charisma, and make STR a dump stat (well, not really, because the knight still has to wear armor). Rather than marking, the knight has an aura 1 defense feature, which I believe is more easily tracked.
The slayer is everything that a fantasy fighter is supposed to be. He can do both ranged and melee attacks, he's highly mobile, he does lots of damage, he's got cool weapon specializations (although its a shame they didn't do another "Heroes of..." book that added, say, a poleax slayer or a longbow slayer)
I will admit that the focus on the fighter having minor-action-activated stances that grant bonuses to basic attacks (both ranged and melee), rather than a variety of a/e/d powers may, indeed be less interesting. I don't necessarily agree that that makes the knight and slayer "boring" to play. At least it is more interesting than "I swing my sword at the monster."
Oh...on that I fully agree. In fact, I use the knight and slayer as a basis for my warrior.
The part that strikes me as dull, is the lack of variety from the Encounter and Daily portion of the E-class fighters.