UngeheuerLich
Legend
The TWF ranger is much more versatile...
the most probable half orc build would be
16/14/14/13/10/8
a 14 in wisdom is enough for a TWF ranger, 16 dex comes in handy for AC/ref and the occasional use of the bow
So you have 18/13/16/10/14/8 You can get chain (and scale) and be perfectly viable in melee and range (at least at the beginnning of your career)
Also Twin strike is the most versatile TWF power since you can focus one enemy or attack two enemies... since both attck rolls are simultaneous, you get any next attack has a +x bonus to both rolls...
If you are perfectly fine with your 14 wisdom, you can skip heavier armor proficiencies and stay with hide armor and just increase str and dex all the way... you will do well enough.
and whirling rend and whirling frenzy are indeed two complete different mechanics... as i see it the character builder is correct and if you don´t make it more complicated than it is, powers are quite easy to understand...
(do you add extra damage to both damage rolls: for weapon and for hunters quarry? i guess no... but if you count seperate dice as seperate rolls, you should consider doing it and now the ranger is once again far ahead in damage output)
the most probable half orc build would be
16/14/14/13/10/8
a 14 in wisdom is enough for a TWF ranger, 16 dex comes in handy for AC/ref and the occasional use of the bow
So you have 18/13/16/10/14/8 You can get chain (and scale) and be perfectly viable in melee and range (at least at the beginnning of your career)
Also Twin strike is the most versatile TWF power since you can focus one enemy or attack two enemies... since both attck rolls are simultaneous, you get any next attack has a +x bonus to both rolls...
If you are perfectly fine with your 14 wisdom, you can skip heavier armor proficiencies and stay with hide armor and just increase str and dex all the way... you will do well enough.

and whirling rend and whirling frenzy are indeed two complete different mechanics... as i see it the character builder is correct and if you don´t make it more complicated than it is, powers are quite easy to understand...
(do you add extra damage to both damage rolls: for weapon and for hunters quarry? i guess no... but if you count seperate dice as seperate rolls, you should consider doing it and now the ranger is once again far ahead in damage output)