- It's very hard to get a permanent staff contract. If you start out as Technical Student, then go on to Fellow, then to staff, you will have to work 8-11 years for the organization before you can be considered for a permanent position. Everyone knows this and I think it leads to unhealthy competition between people on limited contracts, it's a lot of prestige going around.
I also think the contract policy prevents a good distribution of nationalities. I think it scares away people coming from countries with low unemployment rates and a stronger tradition for permanent contracts. At the same time, every opening at CERN is flooded with high quality applicants from the south of Europe where the unemployment rates are high, so CERN's incentives to change this isn't very strong.
- Bureaucracy and hierarchy. Different groups of people working with the same thing, in competition instead of together. I found this demotivating.
- The salary is high but most buildings are old and most computer equipment are outdated. I find this odd.
- 6 days paternity leave.
- Some male-dominated parts of CERN is perhaps not the best place for women. You will have to be strong to work there, and put up with the occasional sexual joke.