...mostly because those melee types are probably already taking penalties with Power Attack...
I like this. Seems very fun to me. And I like the idea of having a ranger that advances more in skill (like, TWF at first level, and then other two-weapon-related bonus feats as they level, but perhaps no magic?) very much. Muy bueno. Etc.
Meh. Rapid Shot doesn't seem so bad by itself (flurry of blows for arrows, basically).
And poo-poo the realism factor. A 6th level ranger is by no means a normal mook...and it does take them to the higher levels to get a fistfull of arrows, only getting two to start with at 6th level (I think 12th will give three, right?).
Ponder it -- is firing two arrows any wierder than chopping through a goblin and driving your blade into the next one? (Cleave) Or moving and striking so fast that your foe doesn't get a chance to react? (Spring Attack)
Doesn't seem too wierd to me, to be honest. Certainly, since D&D heroes are the super-action-jackie-chans of their era, it makes some sense to me.
