I had a very bad experience with Nielsen HR. HRs are the first point of contact and directly represent the company to the candidates, just listing a few facts:
1) I got phone calls without any notice during anytime of the day, and would receive fairly rude emails from the HR person if I did not pick up the call
2) HRs are usually 'requesting' schedules for interviews in the upcoming day or two
3) sometime after I shifted things around to make schedules available in the 'upcoming day or two', HR would disappear for a week and repeat 1) and 2)
4) I got calendar invites for interviews without any explanation on the interviewer or the type of the interview
5) After 1-4), I received an offer with total compensation less than my current role, even though I was fairly clear on what my range of expectation would be
It was a complete waste of time, or not, if you just want to practice interviewing
Overall interaction with actual team members were alright, seems like there are some really smart people working there, which makes you wonder how long/why they are actually going to stay.
Nielsen, please train your HRs.