I work in the pension industry and it can be a very valuable benefit but also has it's drawbacks. For higher income earners, or people who are good at saving and looking to retire early it isn't always a good deal depending on the plan, but it's really fantastic for lower-middle income earners, or higher income earners who suck at saving. It's a forced savings plan that enables what is basically a guaranteed income for life. If you're someone who is making 40-50K for your entire working career, a guaranteed income for life once you hit 60 or 65 is awesome. I think pensions could play a big role in solving a lot of the wealth inequality issues. It's basically a UBI for people who work. I like that a lot and it's why i work in the industry despite the drawbacks I see.
However, for a lot of mustachians who are looking to retire early and are good at saving, pensions may not be a great deal.
1) There are often penalties for early withdrawal, in the plans I work with the earliest you can start withdrawing your pension is age 55 and for every year between 55 and 60 there is a 6% reduction. So if you retire at 55 your pension is worth 30% less. Ouch.
2) If you retire at 50 and leave it in the plan to take at age 60, that benefit is usually then locked in. For 10 years there's no growth, some plans might COLA it at like 1-3% a year. Generally the value it was when you were 50 is the same value when you're 60. If the lump sum of your pension was say 500K, you're losing out on 10 years on returns, that could be worth another 500K that you don't get anymore. That's a bummer.
3) If you want to take a lump sum at say age 50, depending on the investment strategy, the returns may not be as high as a S&P500 index return over your working career, often pension funds are very conservative
4) You have a lack of control, pension funds are run by a board of mostly old white guys who have their own interests and priorities, usually appointed by the employer and/or unions and they usually have the power to alter your benefit if they want. For instance, the reduction i mention in #1 was introduced last year and it was increased from 2% to 6%. So if you were 54 you were looking at retiring with a 10% reduction in a year, that's manageable, suddenly some old white guys decided they dont want early retirement anymore and now you're looking at a 30% reduction, so you gotta work another 5 years. That sucks.
5) If you take your pension and die shortly after you're leaving nothing to your estate
So, I guess like with all things financial, whether a pension is good depends on you, your financial situation, the rules of the plan, and your retirement plans. Make sure you understand the plan rules and how it works if you're planning on retiring early, and look at the board and whether you feel they are competent (many are not). However, I am a big proponent of pensions for most people as most people are not good savers. Having a locked in forced retirement savings is incredibly valuable for most people.