Oh Grodd will totally be back, that's one of the prime villains of the Flash.. I thought they were going to do the Rogues as the final part of the season which they still can really, it should only take 4 episodes and they have I think 6, 7 or 8 left.. but you're right Flash S1 is >> Arrow S3.. Arrow S1 though IMO >> Flash S1 by a long run!
I have a feeling they will have Grodd be Season 2's primary villain, with him mind controlling Eddie for the first part for some more added drama where Barry has to try and figure out whether he can truly save Eddie.
All of the Rogues that Barry has pissed off coming for him at the end would be epic, and I wonder if that will tie into Wells' master plan (if he even has one).
IMO, Arrow season 1 was so good because of the strong emphasis on the epic flashbacks, Oliver becoming the Arrow in Starling and The List, and the fact that his archery and killing skills were over 9000. Flash is quickly becoming so good that it will probably overtake it for me, although Barry hasn't gotten as many chicks this season as Oliver did in his first season. :heenan: