As much as I'd love for the show to succeed, you simply can't do the Rogue's Gallery on a TV budget (at least not accurately). This means either:
- You'll see vastly different (normalized) versions of the Rogues
- You won't see any Rogues at all, simply random bad guys
- You'll see one, maybe two Rogues at most
Arrow got around the 'powers = lots of not-cheap VFX' by making darn near everyone super strong, which can be presented on-screen easily with little to no VFX. Not sure how Flash will tackle that, but they'll have to; while a 'normal' hero can take on powered bad guys, the opposite (a powered hero taking on normal bad guys) will get lame really fast (pun intended).