I had a VERY NEGATIVE interview experience with their Toronto downtown office.
That lady contacted me for the potential opening, then we scheduled a phone interview for the following week. I waited outside for 20 minutes during my lunch time and sent her an email asking if she'd like to reschedule, she replied, saying that fire alarm went off and we need to reschedule to the next day.
Fine. Next day, 5 minutes prior to our time, she sent me an email using her personal Gmail asking for my phone number. Given that I have mentioned my phone number in my resume, email body and my signature, I sent her my phone number one more time. I waited outside for another 30 minutes, no call. Called her, no answer. So I had to leave her another voicemail and email, haven't gotten any response until now. I hope that recruiter lady and her office survived in the fire alarm.
Given such a poor candidate experience, I don't know why Randstad has such a high review. If you cannot manage your hiring process, which should be the critical stage you show your employer image to other recruiting professionals, I don't see your inside is well-organized.