The elephant in the room is the below market compensation. Bay Area is a very pricy place and it's hard to be a happy employee excited about the company when your paycheck is below what your peers in other places make. The days of dreaming about Workday stock hitting $500 are gone and the harsh reality is settling in.
Low efficiency. You think that Workday is a cool company and you think I can get by on a low salary but I'm going to learn something, how about that? Workday does have some nice tricks to learn. It's core HCM product is competitive, customer support is great, finance team is above and beyond, there are bright people here and there. But overall Workday is extremely inefficient. While its major competitors are highly profitable, Workday just can't figure out how to make money. It drags a lot of useless individuals and whole teams, its data centers are underutilized, it's acquiring other companies and developing products and they just don't bring profits in.
Career dead end technologies. Workday tries to reinvent the wheel in many ways. A lot of developers are using a proprietary language called Xpresso - stay as far as you can! It's core products are using in house developed software - same story, very proprietary, not being used outside of Workday. I guess it helps companies to keep salaries low because after a few years it's hard to find jobs outside - this is something to consider.
What happens when you put together a lot of people who can't find jobs outside of this company, keep them working on reinventing the wheel and under pay? Yes, right. Politics, secrecy, nepotism - other reviewers have mentioned it many times and it is true.