The latest doctrinaire chest-thumping match to come out of Blogaria is the question of PCs as heroes vs. PCs as freebooting mercenary sociopaths. No, there is no middle ground....just like ascending vs. descending armor class.
Perhaps you champions of the "no heroes" school of gaming have been blessed with groups of well-adjusted, advanced gamers who can handle playing a character who operates outside the normal moral spectrum or outside the definition of what some might call "heroic." I'm not sure where you're gaming, but it isn't anywhere I've ever been. My experiences, and the experiences of those disparate gamers with whom I have discussed this very issue, can be summarized pretty succinctly:
Your anti-hero character is a douchebag and the rest of the party yearns for his agonizing, horrible death.
The characters who are mercenary/"edgy"/Beyond Good and Evil are usually just gold grubbing dicks with no conviction. Parties of these characters waste entire sessions trying to figure out how to rob the town blacksmith when there is a nearby dungeon containing a vast wealth. They avoid adventures so that they can visit petty abuses on insignificant NPCs.
The characters who are blatantly "evil" are usually just insufferable assholes who verbally abuse all PCs and NPCs while committing random acts of violence and generally being more Snidely Whiplash than Darth Vader. Their master plan is usually something along the lines of secretly pocketing the 25gp amulet your party finds in the goblin's lair before the rest of the party can notice. Oh, you mastermind.
I will acquiesce that "heroes" and good-aligned characters are often huge douchebags and I can nary recall a game session where at least one good character hasn't done something that could easily be argued to be an evil act, but then again, I hate alignment and all that it entails. I have found, however, that when a game (or just a campaign) wears its "we aren't good guys!" attitude on its sleeve, what you tend to end up with is a game about feckless thugs who aren't even fit to be a real villain's henchmen. I find that things work out best when groups either own up to being good guys, or else they leave their moral intentions unstated. If I didn't have 19 years of personal evidence backing up this assertion, I wouldn't be posting it. If I didn't have countless gaming stories from conventions and friends and blogs, I'd be skeptical about what is, admittedly, a sweeping generalization.
...and yet, generalization though it may be, I have a Pavlovian response to hearing about games that go the "let's be bad/ambivalent" guys route, and that response is to get as far away from it as possible.
...and that's what diversity means to me.