There's a difference between simple and nonsensical. Star Wars (1977) was actually competently written and a good story. The Star Trek reboots are awash in incredibly illogical, poorly thought out nonsense.

When Abrams is working from a decent script he makes it work but the writers he usually surrounds himself with show he doesn't care if a script is actually good or not. That or he's incredibly loyal to his friends and will stick with them even if they couldn't write themselves out of a paper bag.