Well Lively is talking about being concerned how she'll stay in the Star Sapphire costume, so she at least seem to think so. (and confirms my suspisions as to why they cast her)
Reynolds actually gave a pretty strong performance throughout. Not as strong as Sinestro, but I wouldn't but the disappointing opening on his shoulders. I can't think of any actor right now who could both do a good job in the part and be a big anough draw by themselves to overcome the "who?" factor of being in DC's second tier.
Honestly, I always saw Reynolds as a perfect Wally West Flash. Not surprised by Mark Strong being solid. Lively in Star Sapphire costume, hmmm I think I saw snippet of that on some cell phone pics.