The Focus was the most successful Ford compact in a long time. Where the Aspire and previous models failed to make a dent in Honda and Toyota sales, the Focus did. The problem with the Focus was that it was rushed into production. A lot of the underpinnings were also outdated. The Focus utilized an engine that was not the most reliable, and the interior parts were also cheap (via Hot Cars).
They had attractive styling, so consumers put up with the drawbacks. But there were better-used cars that you can get for the price that were direct competitors to Focus. Cars like the Lancer and even the Chevy Aveo5 come to mind. The Focus was a car that could use a lot of improvement and there were more sensible options on the road.