One thing i forgot to mention that I like about the new show is that they don't hold Barry back as much as the old show. In the 90s Flash, I remember seeing an episode where he almost died after running 200 miles or so one time, something about him needing to eat or his body not being able to handle the speed for so long. Here, Barry can run 600 miles to Starling City easily, which was cool. I mean, obviously you need to limit him in some ways, but I think the 90s show went too far, although budget might have had something to do with that.
Also, I liked the running effects, I thought they were done well. The tornado thing was especially cool, that's practically a Flash trademark, and it was awesome to see it in live action.