As for green lantern; crap actor, crap looking cgi, crap looking movie. It will be rebooted in a couple of years time guaranteed as it will bomb at the box office.
Eh, the actor can pull off semi-serious. Not everything is Van Wilder. That being said, it will probably still be too comedic. He would've make a good Flash but Hal Jordan is a little bit of a stretch.
Some of the CGI doesn't look to bad. The teasers I've seen lately have the suit looking a little better than some of the early treatments I saw. Having it glow green instead of green cloth works. Besides how to you want them to handle the constructs: opaque green objects, barely wireframe green, translucent green, etc.
I doubt it will get rebooted though. GL is my favorite super hero but but he's not a top-of-the-shelf hero like Superman and Batman. They may drop the concept for many many years if it bombs.