I gave a suggestion regarding the Mobility feat so I suppose it should be no surprise my next suggestion would be regarding the Whirlwind Attack feat. In classic pen and paper D&D, the Whirlwind attack was the epitome of the kick@$$ fighter who has spent his days, nights (and feats) perfecting his craft. It was a hard feat to get to and required dedication on the part of the player, overlooking other feats in his drive to get to the ultimate brawler feat. Well I finally went and did it with my dwarven Tempest. Alas... I was quite disappointed with the end result. It's the same as Cleave, which is easier to get to and requires you only get a single much more useful prerequisite feat (Power attack). Wait... sorry, it's not even quite as good as Cleave as it has an annoying pause at the end of it! Sad considering the illustrious history of such a fine PnP feat and all the prerequisites it requires.
I saw somewhere else someone complaining that their Cleave when dual wielding was not hitting with both weapons. I would consider that intentional. The act of Cleaving is a single attack meant to go through one opponent and hit the next (and so on). Implies one weapon is doing it. If the Whirlwind Attack is going to operate like a cleave in style then THAT is where the second weapon should get it's hit in, when you unleash the Whirlwind. It's classically a potent feat and I feel it's potential is being wasted in DDO.