I enjoyed it, it works well and has plenty of hidden easter eggs for the fans.
Spoiler
Not only was the main villain Flash Rogues Gallery alumnus The Weather Wizard, but we saw got to see a broken cage with Grodd written on it - Gorilla Grodd being a classic Flash foe; during the murder of Mrs Allen we saw a glimpse of Professor Zoom and one of the aircraft had Ferris as it's logo. Ferris airlines was owned by Carl, then his daughter Carol Ferris, who was the girlfriend of Hal Jordan, Green Lantern. So are the CW setting up another show in their DC universe?
As a whole a good start to a new series. It seems DC might not be able to match Marvel on the big screen, but as far as the small screen goes they have the lead. Green Arrow grew over the course of the second series to become, possibly, the best comic related show so far, and complimented with The Flash, with a crossover already they have a basis for a shared universe.
Marvel so far have the Agents of SHIELD that has improved but stumbled badly at the start of that first season.
Now need to work out how The_Bluestocking did that Spoiler button thingy...