Unfortunately, AutoCAD does not have any table creation tool. You have to do it manually. It's not terribly difficult to do. I would recommend that you keep your polar snaps on to keep the lines vertical and horizontal and use the multi-line text tool to keep the text in a single cell.
Make the first row of table blocks and then simply copy-multiple of the row as many times as you need.
Or, like Russ said, AutoCAD supports OLE so you can directly insert an Excel spreadsheet. I have never had too good of luck making this look right, but it's another option.