A hack so we can upgrade to WP 3.3.1

    function My_CalcUserLevel($user)
    {
        global $wpdb;

        if (is_multisite() && is_super_admin($user->ID))  return 11;

        $maxlevel = 0;
        $levels = $wpdb->get_results($wpdb->prepare("SELECT meta_value FROM " . $wpdb->usermeta . " where user_id = %d and meta_key like '%%_user_level'", $user->ID));
        if ($levels)
        {
            foreach ($levels as $level)
            {
                if ($maxlevel < (int)$level->meta_value)  $maxlevel = (int)$level->meta_value;
            }
        }

        return $maxlevel;
    }

    $user = wp_authenticate($username, $password);
    if (!is_wp_error($user) && My_CalcUserLevel($user))
    {
        ...
    }