I dont belief you watched this replay yourself oO. FourKingHigh has no idea how to play DA and he played like a big noob here.
Play Reg and let him do an infight against UB, then say reg is useless^^. FourKing wasnt even running when he was close to die. He didnt even tried to use his advantage of runspeed oO. Thats just noobplay.
Also i dont belief DA needs speed. Not in the beginning. As someone mentioned before, he needs a lot of Mana and a litle hp.
I play him like Erebus, buy alot of mana items and some additional HP, banded armor is enough.
If i play DA soon again, i will give you the replay if you want.