أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
No I don't think so you should criticize their website. Yes you can provide suggestions in a positive way saying how it can be improved. You can start like "In my opinion if ....(What you think about website)". Suggestions are always welcome but criticism might be taken in anegative way.