I really enjoyed this episode, and think it was easily the best one yet.
That said, it's probably the last episode that I'll watch for a while. I've been pretty ambivalent about the show from the start, and I've realized that the only episodes that I really liked were the ones featuring characters from Arrow, and written by Arrow's showrunner (Greg Berlanti). Last night's crossover was a smart idea but ultimately Arrow stole the episode - the cast, characters and story just work better than the Flash.
Hopefully these are just growing pains and the show finds its stride soon - Arrow itself was uneven during it's first season. I'll keep my eyes open for the episode synopsis every week, but don't plan on watching any more episodes except for future crossovers and the big reveal of Grodd. I'll probably binge the rest on Netflix sometime next year when they become available. I'm somewhat disappointed in the new DC shows this year - like the Flash, Gotham isn't particularly good either (although the last few eps have been better). Constantine has been my favourite of the bunch. It started off with a weak pilot but has been really enjoyable since.