Your code doesn’t work because you’re using $bloguser
instead of $user
.
And there’s no point in calling get_userdata() since get_users() already returns user objects:
foreach ($blogusers as $user) {
echo '<tr>';
echo '<td>'. $user->first_name .'</td>';
echo '<td>'. $user->last_name .'</td>';
echo '<td>'. $user->user_login .'</td>';
echo '<td>'. $user->user_email .'</td>';
echo '</tr>';
}