The cast is in my opinion excellent, and all of them manage surprisingly well to walk the line between playing established characters and making them their own, and they get better with it with every movie (Scotty for example is not very good in the first one, but is much better in Into Darkness and quite wonderful in Beyond).
The scripts have holes in them that is very true, especially the first two (Beyond is rather guilty of leaving many question unexplained or merely hinted at, for the sake of not having too much exposition dialogue). Still, they make up for it by being character driven. The first two movies deliver, in my opinion, a fine character arc for Kirk and Spock, and the third one is sort of a culmination of all that, with the eintre cast getting their time to shine and work as a team in proper Star Trek fashion, having become the crew we know. Also, the movies are never, despite some callbacks, rip-offs of the older movies, unlike Episode VII. Even Into Darkness only repeats a few scenes, and does it actually in a somewhat clever way as a means of telling the characters arc through action (having the famous scene reversed as Kirk and Spock finally understand one onether and learn from each other).
It's all entirely unlike the new cast of Star Wars, bland and boring, without any character traits, any arcs, forever whining about having to do anything. Likewise, the villains are much better than the Emo Ren, Admiral Whatshisname and Big Bad Hologram. Nero is a interestingly off-beat villain, furious and imposing but not exactly adept at beinga "villain", with his often casual manner. Cumberbatch was miscast as Khan, but if judged purely on Into Darkness, and not as a recast of Montalban his really not that bad, and he has Peter Weller as Admiral Marcus, who really works very well in my opinion. I've already spoken of Krall in this thread.
I have no complaints about the tone of the movies, and the pace might be a bit to frenetic at times, but the action is usually well anchored with story and performances to have dramatic weight (again, something entirely absent in Force Awakens). Quite a few scenes, especially the Kelvin/Narada battle in the first movie and the battles with the Swarm in Beyond and pretty much everything in Beyond that features the topsy-turvy architecture of Yorktown, look really great, and both in visual design and execution surpass anything in Force Awakens, and in my opinion deserve a place in sci-fi movie history (or at least an honorable mention).
By no means are the new Trek movies perfect (but neither are most of the older ones) and they are not masterpieces. But they are good movies, and definately way better and more interesting ones than Force Awakens.