I have ordered several times via Grubhub over the last couple months and wondered why I could not access the review function for any of the restaurants while logged in. Contacted their "customer service chat" and received various excuses from the rep, including that it was too early to review the restaurant I ate in that day and it would take 2 hours, which he then changed to 24 hours when I said it had been more than 2 hours, and then somehow changed to 72 hours.
He also tried to tell me I'd already reviewed the past restaurants when I had not. Hung up on chat and fired off an email, resulting in my receiving a telephone call from a totally different rep telling me that GrubHub had changed its whole review policy so that you would only be able to write a review after 3 days and then would only have 1 day to write it and furthermore their staff had only done this change 2 or 3 weeks ago and hadn't had time to update the FAQ or website to reflect it.
It sounds to me like they are making the review process super complicated so people just won't leave reviews even if they are good. I told the rep I would be ordering via OrderUp, which allows me to leave reviews, until GrubHub gets its act together.
Reason of review: Poor customer service.
I liked: Food, Idea of the service, Ease of website.
I didn't like: Misleading info, Inability to review restaurants.