Very bad:<p>- Manual loading of jQuery, will lead to multiple jQuery loaded<p>- Missing apparently all action hooks, see wp_head(), wp_footer() etc. This breaks basic blog functionalities and many plugins.<p>Not good:<p>- Hardcoded path to CSS files, see wp_register_style etc<p>- Hardcoded path to JavaScript files, see wp_register_script etc<p><a href="http://codex.wordpress.org/Theme_Development" rel="nofollow">http://codex.wordpress.org/Theme_Development</a> would be a good start.