As a day-one Star Trek fan - the thing that defined Trek in the beginning and (mostly) throughout its many incarnations was that it was smart. It didn't get science perfectly right and used plenty of magic beans, but still the intention was there. There are a lot of scientists on the planet now who were inspired to become so because of Star Trek.
Star Trek into Darkness... is pants-on-head stupid-as-fuck when it comes to the science. It makes up its own rules on everything, including such basic concepts as gravity and how far away the Moon is. As a yarn, an adventure tale, it's fine and even engaging. But every eight seconds something pants-wettingly dumb happens just to keep the story moving forward.
This was exactly what Trek set out to NOT be, and what set it apart from what passed for "science fiction" on television at the time. And so as a Trek fan, I was insulted. Repeatedly.
Abrams however is just about perfect for Star Wars, because there's no science to explain or understand - Star Wars is supposed to be pure adventure in a wonderland where wizards fight with fire swords and monkeys can fly spaceships. I'm looking forward to what he does with that - and for somebody who passed third grade science to tackle the next Star Trek.