Hmm, not sure. Could removed TWF/ambidex as virtual feats, so that that fighting style will not be imposed upon all players using the class (just a personal preference there, though) or could removed favored enemy, since the quarry bonus really finely replaces it, though the favored enemy in addition to the quarry is a nice flavor addition. Or, you could just do D8 HD instead of D10. Or, impose a heavier alignment or multiclassing restriction, or a more strict honor code, whatever works.
Really, each of the above has their drawbacks, but those are all I can think of; the other abilities are too prominent to remove from this class imo.
That is, of course, if it proves to be a little too strong. There is always playtesting
However, as is, it's a roughly 2/3 fighter, 1/3 rogue, 1/5 druid. Eh somethin like that. What I mean is, is rougly 1/2 rogue sneak attack/evasive abilities/skills, fighter HP and BAB, 2 (or 3, depending on if you give ITWF at 9th) bonus feats, with limited druid spells and a few unique abilities. Really good combo. The cost being having to be good, and lacking heavy armor, and not quite getting all of the perks of the parent classes, such as the bonus feats and higher sneak attack and evasion/dodge/special abilities, etc. This version probably wouldn't stop a person from picking a rogue, or a fighter, or a barbarian for that matter in favor of the ranger (in other words it probably wouldn't steal from the other classes too much). Hard to say if it is too much, but it is at least not inadequate. The class gen doesn't lie, though it IS still just a guideline tool. It can be inaccurate with certain combos and such.
Still, kudos to ya for solving the favored enemy problem by putting in the more flexible, player controled quarry bonus. Also sneak attack gives the ranger a real incentive to be stealthy, though I prefer my own little method
