Treebore said:
I do think allowing "any bonus" to be added, especially when reach is involved, boosts the power of this feat greatly, too greatly. But that is my perspective of game balance. Since I am the DM of Darthjaye, that is all that really matters. But I also want to know exactly what WOTC means. Just in case.
Look at the prerequisites for the feat. 1 stat that is nonessential for a combatant. 2 feats that cannot be used in conjunction with it. 2 other feats that do not add to it's power. Base attack of 4.
That's a LOT of prerequisites.
Now, lets look at what the feat ACTUALLY does, as opposed to dreaming up fantasy scenarios which will never happen.
Your fighter 5' steps, takes a full attack, and hits every foe he threatens.
If he's lucky, he realistically might be able to reach 3 foes with this maneuver. Once (remember - he has to have them within reach after no more than a 5' step, so next round they'll just move...)
More than likely, this feat will see use only rarely (at best, once per mass-combat, and usually it'll only get 2 foes) As the fighter increases in level, the chance of this feat being superior to a full attack is going to decline.
Now - lets compare this with great cleave. 2 feats as prerequisites, only one of which is useless. One stat, which is the prime stat for a melee combatant. No action to use.
In general, this feat will see use a lot. My characters that had the lesser version got an extra attack almost every combat that involved multiple foes. As the character's attacks increase, the power of the feat increases.
Which do you think is more powerful?
Which do you think requires less investment?
Now consider that in your game, when you use whirlwind attack you lose all your bonuses to hit.
That, frankly, makes whirlwind attack a spectacular pile of craptastic mess.
In conclusion - you're wrong, and you've got no idea what a balanced feat looks like. And I seriously hope that you told the player about your terrible house rule BEFORE he got the feat.