>>51047176Reynolds lacked the charisma needed to carry an otherwise banal script. Hemsworth carried Thor and Evans carried Cap in spite of their frankly crummy stories. But Reynolds/Hal Jordan was just boring.
In terms of the actual script Parallax and Hector Hammond are terrible villains. Parallax in Johns' run was just a means to setup the actual, main stories (Sinestro Corps, Blackest Night, War of the GLs etc) he was not a villain that could make a film and neither was Hammond.
If they wanted to save Sinestro for 2 and had to draw from Johns' run only then Krona with maybe an army of Manhunters would've made for a more interesting villain for the first film.
As it stands it had a boring villain and a boring protagonist with the more interesting supporting cast (Mark Strong as SInestro was fantastic) not getting nearly enough screen time to make the film passable.