PS is not a word-processor, it is an image processor. At one point in its evolution, it treated all text as pictures, and once you finished typing it, it could not be edited.
This has changed greatly over the years, and now PS finally has decent text editing. But it is not a word-processor, and tables are not something it does.
If you need tables, you should be using some other program. You might be able to fake it with PS, but you will have trouble making something easy to work with.
Now, when ps 8 is announced in the next few days, things may change, but I would not count on it.