I gotta tell ya, I give fan productions a break. However, the level of expectation depends on where the “show” is. For example, the new Voyages/Phase II group is the one Paramount allows the use of the Star Trek name. NV/P2 raised the bar, so it’s on them to keep the standards they set. For the most part, they have. The stories have gotten more streamlined and less “kitchen sink.” I don't see the need to tie in aspects of Trek lore as much as I would rather see something that would likely be seen in an actual episode. So, since the original show didn't do a lot of inner references to one-off characters, I prefer the same thing with fan films. This might be seen as limiting, but I think it forces writers to create more original characters and settings.
Exeter would be in the same league if they had the resources to complete episodes more quickly. They’re an amazing group and it sucks they are sidelined by time, money and God.
The smaller scale ones are honestly just fans making a story based on their favorite show. 99% of these folks don’t have any acting experience. Some may have natural talent that’s pretty painless to watch, but on the whole, professional actors work in the business and get paid.