the only problem i have is on roads with grooves in them that run perpendicular to the direction of travel. Sorry you guys are having these issues, my Focus is perfect, 0 issues.
as far as pull on hard braking or acceleration, that is normal on front wheel drives. My 2000 focus did it as did my 02 focus, 03 focus, 05 Malibu and my new 2012 SEL.
if pull on hard braking is excessive, there can be air in lines on one side, warped rotor, bad caliper... pretty much anything that would cause uneven pressure.
one more thing... how many miles do you guys have again? have you had yours struts inspected? if they have begun leaking and are not functioning properly they could cause some of this.