I know of an agency that uses a yearly evaluation system for its employees. The problem is, the evaluation system isn't tied to anything. There are no points awarded toward promotion or pay incentives. Bad evaluations are only used when it's politically convenient. The evaluations are only relevant under two circumstances: when considering discipline and when time for re-accreditation rolls around.
I have known employees there that have gone three years without an evaluation. In another instance, a sergeant essentially gave a subordinate the same evaluation three years in a row by merely cutting and pasting the text and changing the date. When the chain of command was advised of this, they laughed it off. Unfortunately, these types of incidents create a culture in which no one cares about writing a proper evaluation. The few supervisors who did a good job were often mocked by their peers or given a hard time by their subordinates. "You are the only one who pays attention to this," was often heard as the war cry for mediocrity.
Now let's flip this very situation around. What if people who were never held accountable suddenly were? I mentored my sergeants about the importance of evaluations and how it was more a reflection of them than the employee being evaluated. They were not accustomed to the standards I set. In fact, one of my sergeants thought I was kidding. He turned in an evaluation two weeks late without asking for an extension or offering an excuse. I made my point by taking his assigned vehicle away for two weeks and making him use a pool car instead. It worked.
Two things happened as a result. Over the next four years, the sergeant never turned an evaluation in late, and he took the time to learn how to write outstanding evaluations. Because he was the first one to test me, my other sergeants got the message early and I never had a problem with them. It's funny how having skin in the game changes a person. Your actions will always count more than your words.
That's what having skin in the game really means; it makes people accountable. Being a cop is not a spectator sport. Let it be known what your standards are and what the consequences are for not meeting them. If employees come to you with a problem and they can't meet your deadline that's a different story. Help them with the problem and give them an extension. As long as they are working to resolve the issue, they are still in the game.