PenguinKing said:
After all, if we are to accept that ECL = HD + special abilities, a human should be at least ECL +1 - its bonus feat and skill points are certainly "worth" a class level, yes?
Not necessarily. Every race should have some "free" (i.e. no increase to ECL) abilities, modeled after the core races. This would generally include some ability scored bonuses balanced by drawbacks, as well as some good, but not overly good, racial abilites, such as skill bonuses and such.
The humans give up all of that for a free feat and an extra skill point per level, thus they remain at ECL +0. However, a while back Soldarin ran the core races through his ECL calculator, and found that most of them are much closer to ECL +1 than ECL +0. In fact, one (Gnomes or Elves, IIRC) was even
over ECL +1.
As such, it is entirely possible to have a 3 HD creature be
only +3 ECL. Their extra abilities might not warrant raising the ECL. However, once you get into the middle-to-higher CR monsters, the likelyhood of that happening is pretty slim. Tougher creatures have better racial abilites, and 99% of the time, they make up for their lack of class abilities.
Of course, calculating monster ECLs is still an art, not a science. That's the reason that many people don't allow monster characters to begin with. But so far, the "ECL must be greater than or equal to HD" rule is the only clear one that we've been given, so I'm sticking by it for now.