If it solves your problem there is nothing wrong with it. However, tables are considered problematic because they encode the layout of the page in the HTML. Ideally, you would semantically structure your page using HTML and add style and layout using CSS. This way of working would allow for maximum flexibility - you can restyle your page without ever touching the HTML. If you use tables it becomes much more difficult because the table already adds a certain fixed layout.

Unfortunately the real world hardly ever works like this.