if you're referring to the 2004-onwards model, then yes. it's actually a platform shared with the mazda 3 and volvo S40 of the same year, but even without the reference to those two cars, the focus has quite a reputation to be a solid car. it's a pretty good buy, if you find one with reasonable miles.
and remember to get a trusted mechanic to take a look at any focuses (foci?) you find before buying them, just to be sure your car doesn't turn into a cash pit. a big part of car reliability is the driving and maintenance habits of the owner.