I'm enjoying Constantine, it hasn't wowed me yet but it's rare for a show to come out as strong as the Flash has in its first episodes so I'm not too worried, the show gives me something to watch on thursdays and has been kinda fun so far, and I do feel each episode has been an improvement so far.
And geez, that trailer was awesome, this show as a whole just seems to keep getting better, and I take it that trailer is final confirmation that they'll start calling him the Flash in episode 6, so much to look forward to this season, it's a good thing Flash has so many stories and villains to draw from because this season is throwing everything it can fit into it.