You can't or rather shouldn't compare the crew of the Enterprise: the Flag ship of the Federation with the Voyager. Only the top graduates of the Academy serve on the Enterprise, anyone else serves on all the rest. Sorry but it's like comparing the crew of the Queen Mary to the crew of a Carnival Cruise ship.
Yes, I can compare them, and really its more relevant to say its like comparing the crew of a modern day flagship with, say, a frigate or something. Theyre both instruments of the same authority, and theyre both highly prized in terms of technology, if not grandeur. The crew of the frigate might not be quite as good as the crew of the flagship, but they would still have had to go through years of training and experience in order to be trusted and relied upon with such responsibilities. Not everybody on board was starfleet, but the ones that werent did have skills learnt from the maquis.
The point was, Voyager was a ship of average people with an extraordinary task set before them.
You mean the average people who built a ship capable of breaking a speed barrier previously thought impossible by the federations top scientists?
Even if they are just ordinary people, that doesnt invalidate the point Im making. The problem is that so many other people on the ship seem to be just as capable at engineering as her; there wasnt anything she alone seemed capable of doing, as had been the case with Scotty, Laforge and O'Brien. She did indeed drop out of the academy, but then she also spent that time with Chakotay, in which she acted as chief engineer on his ship.